Agricultural Sciences

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http://hdl.handle.net/20.500.14096/18

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Inclusion levels of tree and herbaceous legumes on nutritive quality of grass silage: results from on-farm trials
(Springer Nature, 2023-09-28) Ebro, Abule; Aranguiz, Adolfo Alvarez; Nemera, Fekadu; Bijdevaate, Lisan; Addis, Haymanot; Demise, Hailu; van der Lee, Jan
The escalating prices of protein concentrate supplements and increasing demand for dairy products in Ethiopia call for preservation of surplus forage during the growing season, to be fed to dairy cows at time of feed shortage. The objective of this on-farm study was to evaluate the nutritive quality of Napier and Desho grass silages with tree legume (sesbania) and herbaceous legumes (alfalfa, lablab, and faba bean) as legume components. Napier or Desho grasses were ensiled in bags with each legume at 0, 20, 30 and 40% inclusion levels (fresh weight). Replicates included nine and six farms in Mecha and Ad’aa districts, respectively. Silage bags were opened after 60 days, samples were taken for chemical analyses and evaluated for physical features. Data were analyzed using a completely randomized design in SPSS and differences among means separated using Duncan’s. Silages were firm at Mecha and fairly firm at Ada’a. No mold appeared. pH values varied from 3.94 to 4.5 and increased (p < 0.001) with increasing levels of legume inclusion. The crude protein values followed a similar pattern to that of the pH. The fiber contents, NDF (p < 0.001) and ADF (p < 0.05/p < 0.01) declined while that of ADL increased (p < 0.001) with increasing legume inclusion levels. The different legume-based silages were assessed as highly palatable and revealed that the use of tree and herbaceous legumes can improve the nutritive quality of grasses.
Highlighting the potential of multilevel statistical models for analysis of individual agroforestry systems
(Springer Nature, 2023-07-09) Golicz, Karolina; Piepho, Hans-Peter; Minarsch, Eva-Maria L.; Niether, Wiebke; Große‑Stoltenberg, André; Oldeland, Jens; Breuer, Lutz; Gattinger, Andreas; Jacos, Suzanne
Agroforestry is a land-use system that combines arable and/or livestock management with tree cultivation, which has been shown to provide a wide range of socio-economic and ecological benefits. It is considered a promising strategy for enhancing resilience of agricultural systems that must remain productive despite increasing environmental and societal pressures. However, agroforestry systems pose a number of challenges for experimental research and scientific hypothesis testing because of their inherent spatiotemporal complexity. We reviewed current approaches to data analysis and sampling strategies of bio-physico-chemical indicators, including crop yield, in European temperate agroforestry systems to examine the existing statistical methods used in agroforestry experiments. We found multilevel models, which are commonly employed in ecology, to be underused and under-described in agroforestry system analysis. This Short Communication together with a companion R script are designed to act as an introduction to multilevel models and to promote their use in agroforestry research.
Labour relations and working conditions of workers on smallholder cocoa farms in Ghana
(Springer Nature, 2023-06-16) Kissi, Evans Appiah; Herzig, Christian
The millions of farm workers in the Global South are an important resource for smallholder producers. However, research on their labour organisation is limited. This article focuses on smallholder farm workers in Ghana’s cocoa sector, drawing on insights from qualitative interviews and the concept of bargaining power. We review the labour relations and working conditions of two historical and informally identified labour supply setups (LSSs) in Ghana’s cocoa sector, namely, hired labour and Abusa, a form of landowner–caretaker relations, and identify an imbalance of horizontal power. Further, we analyse the labour relations and working conditions of an emerging and formal LSS in Ghana’s cocoa sector: private labour providers (PLPs). We argue that PLPs are likely to address the imbalance of horizontal power between farm workers and smallholders and bring about significant improvements in the working conditions of farm workers. We also assess the sustainability potential and limitations of PLPs and argue that tensions exist. We contribute to the growing horizontal power perspective by providing avenues for research and policy related to promoting sustained labour rights for farm workers in smallholder agriculture in the Global South.
Understanding the pathways to women’s empowerment in Northern Ghana and the relationship with small-scale irrigation
(Springer Nature, 2022-01-17) Bryan, Elizabeth; Garner, Elisabeth
Women’s empowerment is often an important goal of development interventions. This paper explores local perceptions of empowerment in the Upper East Region of Ghana and the pathways through which small-scale irrigation intervention targeted to men and women farmers contributes to women’s empowerment. Using qualitative data collected with 144 farmers and traders through 28 individual interviews and 16 focus group discussions, this paper innovates a framework to integrate the linkages between small-scale irrigation and three dimensions of women’s empowerment: resources, agency, and achievements. The relationship between the components of empowerment and small-scale irrigation are placed within a larger context of social change underlying these relationships. This shows that many women face serious constraints to participating in and benefitting from small-scale irrigation, including difficulties accessing land and water and gender norms that limit women’s ability to control farm assets. Despite these constraints, many women do benefit from participating in irrigated farming activities leading to an increase in their agency and well-being achievements. For some women, these benefits are indirect—these women allocate their time to more preferred activities when the household gains access to modern irrigation technology. The result is a new approach to understanding women’s empowerment in relation to irrigation technology.
Social norms and perceptions drive women’s participation in agricultural decisions in West Java, Indonesia
(Springer Nature, 2021-11-02) Qanti, Sara Ratna; Peralta, Alexandra; Zheng, Di
Increasing women’s participation in intrahousehold decision-making has been linked with increased agricultural productivity and economic development. Existing studies focus on identifying the decision-maker and exploring factors affecting women’s participation, yet the context in which households make decisions is generally ignored. This paper narrows this gap by investigating perceptions of women's participation and the roles of social norms in agricultural decision-making. It specifically applies a fine-scale quantitative responses tool and constructs a women’s participation index (WPI) to measure men’s and women’s perceptions regarding women’s participation in decisions about 21 agricultural activities. The study further examines the correlation between social norms in these perceptions as measured by the WPI for 439 couples in West Java, Indonesia. We find that first, men and women have different perceptions about women's decision-making in agricultural activities, but the same perceptions of the types of activities in which women have the most and the least participation. Second, joint decisions come in various combinations but overall, the women’s role is smaller. Third, social norms influence spouses' perceptions of decision-making participation, which explains most of the variation of the WPI. These results suggest that rigorous consideration of social norms is required to understand intrahousehold decision-making.
Increasing crop rotational diversity can enhance cereal yields
(Springer Nature, 2023-03-23) Smith, Monique E.; Vico, Guilia; Costa, Alessio; Bowles, Timothy; Gaudin, Amélie C. M.; Hallin, Sara; Watson, Christine A.; Alarcòn, Remedios; Berti, Antonio; Blecharczyk, Andrzej; Calderon, Francisco J.; Culman, Steve; Deen, William; Drury, Craig F.; Garcia y. Garcia, Axel; García-Díaz, Andrés; Plaza, Eva Hernández; Jonczyk, Krzysztof; Jäck, Ortrud; Lehman, R. Michael; Montemurro, Francesco; Morari, Francesco; Onofri, Andrea; Osbourne, Shannon L.; Pasamón, José Luis Tenorio; Sandstöm, Boël; Santín-Montanyá, Inés; Sawinska, Zuzanna; Schmer, Marty R.; Stalenga, Jaroslaw; Strock, Jeffrey; Tei, Francesco; Topp, Cairistiona F. E.; Ventrella, Domenico; Walker, Robin L.; Bommarco, Riccardo
Diversifying agriculture by rotating a greater number of crop species in sequence is a promising practice to reduce negative impacts of crop production on the environment and maintain yields. However, it is unclear to what extent cereal yields change with crop rotation diversity and external nitrogen fertilization level over time, and which functional groups of crops provide the most yield benefit. Here, using grain yield data of small grain cereals and maize from 32 long-term (10–63 years) experiments across Europe and North America, we show that crop rotational diversity, measured as crop species diversity and functional richness, enhanced grain yields. This yield benefit increased over time. Only the yields of winter-sown small grain cereals showed a decline at the highest level of species diversity. Diversification was beneficial to all cereals with a low external nitrogen input, particularly maize, enabling a lower dependence on nitrogen fertilisers and ultimately reducing greenhouse gas emissions and nitrogen pollution. The results suggest that increasing crop functional richness rather than species diversity can be a strategy for supporting grain yields across many environments.
Manure amendment can reduce rice yield loss under extreme temperatures
(Springer Nature, 2022-06-27) Zhu, Xiangcheng; Chen, Jin; Huang, Shan; Li, Weiwei; Penuelas, Josep; Chen, Ji; Zhou, Feng; Zhang, Weijan; Li, Ganghua; Liu, Zhenghui; Ding, Yanfeng; Wang, Songhan; van Groenigen, Kees Jan; Jiang, Yu
Extreme temperatures are predicted to become increasingly common due to climate change, threatening the sustainability and profitability of global rice production. Manure amendment is a common agricultural practice to improve soil fertility and increase crop yields, but whether this practice modulates the effect of extreme temperatures on crop yield is unclear. Here we show through a series of experiments and meta-analysis that long-term manure amendment reduces losses of rice yield due to extreme temperatures. We propose that by increasing soil fertility, manure amendment increased net photosynthetic rate and plant physiological resistance to extreme temperatures. Without considering the impact of other global change factors, we estimate that manure amendment could potentially reduce global losses of rice yield due to extreme temperatures from 33.6 to 25.1%. Thus, our findings indicate that manure amendment may play a key role in improving food security in a changing climate.
Unearthing the entangled roots of urban agriculture
(Springer Nature, 2020-11-24) London, Jonathan K.; Cutts, Bethany B.; Schwartz, Kirsten; Schmidt, Li; Cadenasso, Mary L.
This study examines urban agriculture (UA) in Sacramento, California (USA), the nation's self-branded “Farm-to-Fork Capital,” in order to highlight UA’s distinct yet entangled roots. The study is based on 24 interviews with a diverse array of UA leaders, conducted as part of a five-year transdisciplinary study of UA in Sacramento. In it, we unearth three primary “taproots” of UA projects, each with its own historical legacies, normative visions, and racial dynamics. In particular, we examine UA projects with “justice taproots,” “health taproots,” and “market taproots.” We use this analysis to understand how different kinds of UA projects are embedded in racial capitalism in ways that transform relationships between people, the city, and food systems. Unearthing these entangled roots helps illuminate UA’s underlying politics, showing how these roots grow in both competitive and symbiotic ways within the soil matrix of racial capitalism. We argue that these roots interact differently with racial capitalism, creating disparities in their growth trajectories. In particular, UA projects associated with the justice taproot are historically underrepresented and undervalued. However, we argue that there are some prospects for building alliances between the UA movement’s three roots, and that these are both promising and problematic.
Effects of development interventions on biocultural diversity: a case study from the Pamir Mountains
(Springer Nature, 2019-12-23) Haider, L. Jamila; Boonstra, Wiebren J.; Akobirshoeva, Anzurat; Schlüter, Maja
The relationship between nature and culture in biocultural landscapes runs deep, where everyday practices and rituals have coevolved with the environment over millennia. Such tightly intertwined social–ecological systems are, however, often in the world’s poorest regions and commonly subject to development interventions which effect biocultural diversity. This paper investigates the social and ecological implications of an introduced wheat seed in the Pamir Mountains. We examine contrasting responses to the intervention through participatory observation of food practices around a New Year ritual, and interviews in two communities. Our results show how one community fostered biocultural diversity, while the other did not, resulting in divergent processes of social and cultural change. In the former, ritual is practiced with traditional seed varieties, involving reciprocal exchange and is characterised by little outmigration of youth. In contrast, the second community celebrates the ritual with replaced store-bought ingredients, no longer cultivates any grain crops and where circular migration to Russia is the main livelihood strategy. Coevolution as an analytical lens enables us to understand these divergent pathways as processes of dynamically changing social–ecological relations. The paper suggests that a deeper understanding of social–ecological relationships in landscapes offers a dynamic and process-oriented understanding of development interventions and can help identify endogenous responses to local, regional and global change—thereby empowering more appropriate and effective development pathways.
The abandonment of maize landraces over the last 50 years in Morelos, Mexico: a tracing study using a multi-level perspective
(Springer Nature, 2019-03-27) McLean‑Rodríguez, Francis Denisse; Camacho‑Villa, Tania Carolina; Almekinders, Conny J. M.; Pè, Mario Enrico; Dell’Acqua, Matteo; Costich, Denise E.
Understanding the causes of maize landrace loss in farmers’ field is essential to design effective conservation strategies. These strategies are necessary to ensure that genetic resources are available in the future. Previous studies have shown that this loss is caused by multiple factors. In this longitudinal study, we used a collection of 93 maize landrace accessions from Morelos, Mexico, and stored at the International Maize and Wheat Improvement Center (CIMMYT) Maize Germplasm Bank, to trace back to the original 66 donor families after 50 years and explore the causes for why they abandoned or conserved their seed lots. We used an actor-centered approach, based on interviews and focus group discussions. We adopt a Multi-Level Perspective framework to examine loss as a process, accommodating multiple causes and the interactions among them. We found that the importance of maize landrace cultivation had diminished over the last 50 years in the study area. By 2017, 13 families had conserved a total of 14 seed lots directly descended from the 1967 collection. Focus group participants identified 60 accessions that could still be found in the surrounding municipalities. Our findings showed that multiple interconnected changes in maize cultivation technologies, as well as in maize markets, other crop markets, agricultural and land policies, cultural preferences, urbanization and climate change, have created an unfavorable environment for the conservation of maize landraces. Many of these processes were location- and landrace-specific, and often led to landrace abandonment during the shift from one farmer generation to the next.
What happens after technology adoption? Gendered aspects of small-scale irrigation technologies in Ethiopia, Ghana, and Tanzania
(Springer Nature, 2018-04-25) Theis, Sophie; Lefore, Nicole; Meinzen-Dick, Ruth; Bryan, Elizabeth
Diverse agricultural technologies are promoted to increase yields and incomes, save time, improve food and nutritional security, and even empower women. Yet a gender gap in technology adoption remains for many agricultural technologies, even for those that are promoted for women. This paper complements the literature on gender and technology adoption, which largely focuses on reasons for low rates of female technology adoption, by shifting attention to what happens within a household after it adopts a technology. Understanding the expected benefits and costs of adoption, from the perspective of women users in households with adult males, can help explain observed technology adoption rates and why technology adoption is often not sustained in the longer term. Drawing on qualitative data from Ethiopia, Ghana, and Tanzania, this paper develops a framework for examining the intrahousehold distribution of benefits from technology adoption, focusing on small-scale irrigation technologies. The framework contributes to the conceptual and empirical exploration of joint control over technology by men and women in the same household. Efforts to promote technology adoption for agricultural development and women’s empowerment would benefit from an understanding of intrahousehold control over technology to avoid interpreting technology adoption as an end in and of itself.
What is a food system? Exploring enactments of the food system multiple
(Springer Nature, 2023-04-29) Brock, Samara
Recent years have seen widespread calls to transform food systems to address complex demands such as feeding a growing global population while reducing environmental impacts. But what is a food system and how can we most effectively work to change it? “Food System” can be found describing more limited dietary regimens as well as sector-specific supply chains going back to the 1930s, but its use to describe very large, dynamic, coupled socio-ecological systems gained traction in academic and civil society publications in the 1990s and this use of the term has increased dramatically in recent years. When the influential food system actors from non-governmental organizations, foundations, consultancies, and the UN that this research focuses on talk about food systems, they seem to be talking about the same thing. Yet the interpretive flexibility of the concept obfuscates that people may have very different framings that may be deeply incompatible. Drawing from interviews, participant observation, and document analysis, this paper examines what food systems thinking does in terms of setting the stage for how we enact the food system and efforts to intervene in it. It reveals that rather than leading to more expansive understanding, the unexamined use of the concept food system might actually serve to sharpen divides.
Ag-tech, agroecology, and the politics of alternative farming futures: The challenges of bringing together diverse agricultural epistemologies
(Springer Nature, 2023-04-21) Sullivan, Summer
Agricultural-technology (ag-tech) and agroecology both promise a better farming future. Ag-tech seeks to improve the food system through the development of high-tech tools such as sensors, digital platforms, and robotic harvesters, with many ag-tech start-ups promising to deliver increased agricultural productivity while also enhancing food system sustainability. Agroecology incorporates diverse cropping systems, low external resource inputs, indigenous and farmer knowledge, and is increasingly associated with political calls for a more just food system. Recently, demand has grown for the potentially groundbreaking benefits of their convergence, with the University of California, Santa Cruz (UCSC) attempting just such a union. Building on its combined expertise in engineering and agroecology, as well as a longstanding reputation as a socially progressive institution, university administrators believe that UCSC could produce a unique, socially just form of ag-tech designed for small, low-resource farmers—a rare contribution given ag-tech’s tendency to cater primarily to large-scale agribusiness. This paper examines the complexities of uniting agroecology and ag-tech through interviews with agroecologists, engineers, and social scientists involved in UCSC’s ag-tech initiative. Within the setting of a historically radical yet neoliberalizing university, I find that significant epistemic and structural barriers exist for agroecology and ag-tech to come together on an even playing field. This case study contributes to broader discussions of the future of food and farming by focusing on the contours and challenges of a widely called-for agricultural collaboration, highlighting its difficulty but also areas of possibility in a particularly rich, contested context.
Beyond farming women: queering gender, work and family farms
(Springer Nature, 2023-04-27) Pfammatter, Prisca; Jongerden, Joost
The issue of gender and agriculture has been on the research agendas of civil society organisations, governments, and academia since the 1970s. Starting from the role of women in agriculture, research has mainly focused on the gendered division of work and the normative constitution of the farm as masculine. Although the gendered division of work has been questioned, the idea of binary gender has mostly been taken as a given. This explorative research shifts the attention from the production of (traditional) gender roles to the making and unmaking of binary gender. An ethnographic study of four farms in Switzerland is drawn on to explore queer farming practices and investigate how queer farmers navigate gender normativity and what this tells us about gender in agriculture more broadly. After considering the mechanisms through which queer farmers are discouraged from farming as a livelihood on the basis of their sex, gender or sexuality, this article argues that queer farmers de- and re-construct gender and farming identities differently, which has research and policy implications for a more diverse and resilient rurality.
The art of Buddhist connectivity: Organic rice farming in Thailand
(Springer Nature, 2022-12-29) Limprapoowiwattana, Chanatporn
This article analyses the interplay between the International Federation of Organic Agriculture Movements (IFOAM) standard, Buddhist socio-economic imaginaries, and values within the global production network (GPN) of organic rice. It asks, “How do transnational standardisation and local values interact in the global production network of organic rice?” Little research has been conducted on the imaginaries and values embedded in the GPNs of organic food. This research aims to fill this gap by examining the transition to organic agriculture among two prominent organic rice farming communities in Thailand, namely the Naso Producer Group and the Ban Thap Thai Organic Agricultural Cooperative. The article draws on a combination of desk research; interviews with governmental and non-governmental officials, standard experts/certifiers, and representatives of the IFOAM; focus group discussions and photo-elicitation sessions with organic rice farmers; on-site observations; and participant observations of mindfulness meditation courses and interviews with Buddhist monks. The results show that Buddhist socio-economic imaginaries have informed the way in which Thai organic rice farmers reconnect to their arable land through an organic farming method, enabling them to live meaningfully and mindfully. This implies that the connectivity of the GPNs of organic rice is not created purely by standards and certifications formulated by transnational private actors; rather, it is also shaped to a large extent by community values and shifts in local mindsets. This article contributes to the literature on food philosophy in the developing world and the governance of the GPNs of organic rice.
Window dressing inequalities and constructing women farmers as problematic—gender in Rwanda’s agriculture policy
(Springer Nature, 2022-03-12) Andersson, Karolin; Pettersson, Katarina; Lodin, Johanna Bergman
Rwanda is often depicted as a success story by policy makers when it comes to issues of gender. In this paper, we show how the problem of gendered inequality in agriculture nevertheless is both marginalized and instrumentalized in Rwanda’s agriculture policy. Our in-depth analysis of 12 national policies is informed by Bacchi’s What’s the problem represented to be? approach. It attests that gendered inequality is largely left unproblematized as well as reduced to a problem of women’s low agricultural productivity. The policy focuses on framing the symptoms and effects of gendered inequality and turns gender mainstreaming into an instrument for national economic growth. We argue that by insufficiently addressing the socio-political underlying causes of gendered inequality, Rwanda’s agriculture policy risks reproducing and exacerbating inequalities by reinforcing dominant gender relations and constructing women farmers as problematic and men as normative farmers. We call for the policy to approach gendered inequality in alternative ways. Drawing on perspectives in feminist political ecology, we discuss how such alternatives could allow policy to more profoundly challenge underlying structural constraints such as unequal gender relations of power, gender norms, and gender divisions of work. This would shift policy’s problematizing lens from economic growth to social justice, and from women’s shortcomings and disadvantages in agriculture to the practices and relations that perpetuate inequality. In the long term, this could lead to transformed gender norms and power relations, and a more just and equal future beyond what the dominant agricultural development discourse currently permits.
Male and stale? Questioning the role of “opinion leaders” in agricultural programs
(Springer Nature, 2023-02-19) Matous, Petr
Social networks can influence people’s behaviour and therefore it is assumed that central individuals in social networks, also called “opinion leaders”, play a key role in driving change in agricultural and food systems. I analyse the outcomes of an intervention (that encouraged Sulawesi smallholder farmers to take a specific action toward improving the health of their cocoa trees) to assess the impact of engaging opinion leaders in agricultural programs that aim to change farmers’ practices. The intervention has been implemented through (a) 18 opinion leaders identified by interviews and a social network survey of 1885 cocoa farmers; and (b) 18 randomly selected farmers who were not central in local social networks. The obtained social networks and statistical data were quantitatively analysed and the results were interpreted with input from the field staff. Contrary to expectations, the highly socially central opinion leaders were not more effective in promoting the initiative in their communities. On average, randomly selected low-centrality farmers convinced almost twice as many of their peers to take the recommended action as compared to the identified opinion leaders (17.1 versus 8.6) but the variation within the random group was also significantly higher. Importantly, while the identified opinion leaders were mostly senior men, women performed better in influencing others into taking action even when their centrality in local social networks of agricultural advice was lower. I discuss the implications of the conventional selection of perceived opinion leaders as model farmers for achieving sustainable and equitable change at scale in agriculture and propose practical alternatives.
Soil CO2 emissions in cropland with fodder maize (Zea mays L.) with and without riparian bufer strips of differing vegetation
(Springer Nature, 2022) Dlamini, J. C.; Cardenas, L. M.; Tesfamariam, E. H.; Dunn, R. M.; Evans, J.; Hawkins, J. M. B.; Blackwell, M. S. A.; Collins, A. L.
Vegetated land areas play a significant role in determining the fate of carbon (C) in the global C cycle. Riparian buffer vegetation is primarily implemented for water quality purposes as they attenuate pollutants from immediately adjacent croplands before reaching freashwater systems. However, their prevailing conditions may sometimes promote the production and subsequent emissions of soil carbon dioxide (CO2). Despite this, the understanding of soil CO2 emissions from riparian buffer vegetation and a direct comparison with adjacent croplands they serve remain elusive. In order to quantify the extent of CO2 emissions in such an agro system, we measured CO2 emissions simultaneously with soil and environmental variables for six months in a replicated plot-scale facility comprising of maize cropping served by three vegetated riparian buffers, namely: (i) a novel grass riparian buffer; (ii) a willow riparian buffer, and; (iii) a woodland riparian buffer. These buffered treatments were compared with a no-buffer control. The woodland (322.9 ± 3.1 kg ha− 1) and grass (285 ± 2.7 kg ha− 1) riparian buffer treatments (not significant to each other) generated significantly (p = < 0.0001) the largest CO2 compared to the remainder of the treatments. Our results suggest that during maize production in general, the woodland and grass riparian buffers serving a maize crop pose a CO2 threat. The results of the current study point to the need to consider the benefits for gaseous emissions of mitigation measures conventionally implemented for improving the sustainability of water resources.
Modelling greenhouse gas emissions of cacao production in the Republic of Côte d’Ivoire
(Springer Nature, 2022) Vervuurt, W.; Slingerland, M. A.; Pronk, A. A.; Van Bussel, L. G. J.
The current expansion of cacao cultivation in the Republic of Côte d’Ivoire is associated with deforestation, forest degradation, biodiversity loss and high greenhouse gas (GHG) emissions. Global concerns about emissions that are associated with tropical commodity production are increasing. Consequently, there is a need to change the present cacao-growing practice into a more climate-friendly cultivation system. A more climate-friendly system causes lower GHG emissions, stores a high amount of carbon in its standing biomass and produces high cacao yields. GHG emissions and carbon stocks associated with the present cacao production, as assessed in 509 farmers’ fields, were estimated by using the Perennial GHG model and the Cool Farm Tool. On average, the production of 1 kg cacao beans is associated with an emission of 1.47 kg CO2e. Deforestation contributed largely to GHG emissions, while tree biomass and residue management contributed mainly to carbon storage. The collected data combined with the model simulations revealed that it is feasible to produce relatively high yields while at the same time storing a high amount of carbon in the standing biomass and causing low GHG emissions. The climate-friendliness of cacao production is strongly related to farm management, especially the number of shade trees and management of residues. Calculated emissions related to good agricultural practices were 2.29 kg CO2e per kg cacao beans. The higher emissions due to the use of more agro-inputs and other residue management practices such as recommended burning of residues for sanitary reasons were not compensated for by higher yields. This indicates a need to revisit recommended practices with respect to climate change mitigation objectives.
Allelopathic effects of leachates of Juglans regia L., Populus tremula L. and juglone on germination of temperate zone cultivated medicinal and aromatic plants
(Springer Nature, 2021-02) Zubay, Péter; Kunzelmann, Jakob; Ittzés, András; Zámborine, Éva Németh; Szabó, Krisztina
The environmental benefits of agroforestry systems are well known. However, current knowledge of potential allelopathic interactions is inadequate. The decrease in soil fertility, the increasingly rhapsodic distribution of precipitation, and the special metabolism and cultivation of medicinal and aromatic plants are all harbingers of medicinal-agroforestry systems. The authors aimed to discover the allelopathic effects of Juglans regia L. and Populus tremula L. on germination of medicinal and aromatic plants cultivated in a temperate zone. Accordingly, an in vitro germination trial was conducted with leachates of these trees and two juglone concentrations. These allelopathic effects were evaluated for germination vigour, germination rate, and total fresh weight of seedlings of twelve different species. A pronounced species specificity was observed in tolerance of seeds and seedlings to the allelopathic effect of Populus and Juglans. In four of the species studied, the allelopathic effect may inhibit germination, but only initially. Poppy and angelica proved to be the most sensitive to the treatments. The following species had relative tolerance to the allelochemicals, so further research under natural conditions is suggested for: Althea officinalis L. (9.34 ± 5.04–68.66 ± 13.62 GR%), Anethum graveolens L. (12.00 ± 2.00–100.00 ± 6.12 GR%), Cannabis sativa L. (72.66 ± 9.02–91.34 ± 1.16 GR%), Dracocephalum moldavica L. (38.00 ± 2.00–80.00 ± 17.44 GR%), Linum usitatissimum L. (44.66 ± 2.00–58.00 ± 3.46 GR%), and Satureja hortensis L. (52.00 ± 28.22–82.00 ± 8.00 GR%). The aim would be to introduce them into agroforestry systems.

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