It is accepted generally that anaerobic digesters (AD) are efficacious technologies for reducing greenhouse gas emissions from livestock operations (Pronto and Gooch, 2009). In addition, AD technology has a number of other potential benefits including: energy production for use on the farm and for sale, separation of manure solids for ease of use or export off-farm, pathogen reduction leading to healthier labor and herd outcomes and odor control. It is also clear that in the USA, research and extension efforts, including public financing of AD technology installations, have disproportionally been focused on larger farms- e.g., dairy farms with at least 500 milking cows. The latter has begun to change as more resources are being invested in AD technology for smaller livestock farms. We present the results of a pre and post survey implemented at four workshops on small-scale AD technology for livestock farmers in northeastern New York State. Results indicate that information presented shifted farmers’ attitudes such that they viewed AD technology as not overly complex; and, they became less interested in selling generated surplus power off-farm.

In the conventional cropping systems, increased costs and resource pollution are attributed to the intensive use of chemical inputs. The adoption of cover crops could be a part of a suitable strategy for improving the sustainability of the agro-ecosystems due to their ability to affect nutrient and weed management. A 2-yr field experiments were conducted in Gorgan, North of Iran, with the aim of assessing the effect of cover crop residue management and herbicide rates on weed management and the yield of tomato crop. The treatments consisted in: (a) three winter soil management: two cover crops [annual medic (Medicago scutellata L.) and barley (Hordeum vulgare L.)] and no covered soil; (b) two soil tillage (no-tillage, where cover crop residues were left in strips on the soil surface, and conventional tillage, where cover crop residues were green manured at 30 cm of soil depth); and (c) three pre-emergence herbicide rates (no-herbicide application, half rate recommended or full rate recommended ). Cover crops were sown in early September and mechanically suppressed in March about 2 weeks before tomato transplanting. At cover crop suppression, annual medic showed the highest aboveground biomass [569 g m−2 of dry matter (DM)], while barley showed the lowest weed content (32 g m−2 of DM). At tomato harvesting, weed density and aboveground biomass ranged from 6.9 to 61.5 plants m−2 and from 33.6 and 1157.0 g m−2 of DM, respectively. Cover crop residues placed on soil surface suppressed weeds more effectively than incorporated residues, especially in barley, mainly due to the physical barrier of residues which reduced the stimulation of weed germination and establishment. As expected, herbicide rate decreased both weed density and biomass, even if the adoption of annual medic and barley cover crops before the tomato cultivation could allow a possible reduction of herbicide rate while maintaining similar fruit yield. Tomato yield was higher in annual medic than barley and no cover regardless of tillage management (on average 62.3, 51.8 and 50.1 t ha−1 of fresh matter, respectively) probably due to an abundant availability of soil nitrogen throughout the tomato cultivation. This was confirmed by high and constant values of tomato N status grown in annual medic and evaluated using SPAD chlorophyll meter. Although further research of cover crop residue management is required to obtain a better understanding on herbicide rate reduction, these preliminary results could be extended to other vegetable crops which have similar requirements of tomato.

In this paper, we assess whether or not organic agriculture has a positive impact on local economies. We first identify organic agriculture hotspots (clusters of counties with positively correlated high numbers of organic operations) using spatial statistics. Then, we estimate a treatment effects model that classifies a county's membership in an organic hotspot as an endogenous treatment variable. By modeling what a hotspot county's economic indicators would have been had the county not been part of a hotspot, this model captures the effect of being in a hotspot on a county's economic indicators. We perform the same analysis for general agricultural farm hotspots to confirm that the benefits associated with organic production hotspots are, in fact, due to the organic component. Our results show that organic hotspot membership leads to a lower county-level poverty rate and a higher median household income. A similar result is not found when investigating the impact of general agriculture hotspots. On the other hand, our result is robust to alternative hotspot definitions based on type of organic operations to alternative methods of estimating average treatment effects on the treated. These results provide strong motivation for considering hotspots of organic handling operations, which refers to middlemen such as processors, wholesalers and brokers, and hotspots of organic production to be local economic development tools, and may be of interest to policymakers whose objective is to promote rural development. Our results may incentivize policymakers to specifically focus on organic development, rather than the more general development of agriculture, as a means to promote economic growth in rural areas, and may further point them in the direction of not only encouraging the presence of organic operations, but of fostering the development of clusters or hotspots of these operations.

Growing concern regarding environmental, social, economic and food quality outcomes of the modern global industrial food system as well as the implications of climate change on food security and food system sustainability have fomented interest in, and action to advance localized food systems. Environmental stewardship is an oft-touted benefit of food system localization. However, few studies have comparatively examined actual environmental benefits of local versus global supply systems and most focus on only one aspect (e.g., GHG emissions). The study reported here comparatively analyzes land, water, carbon and ecological footprints of a localized food supply and contemporary global food supply for the South-West British Columbia (Canada), bioregion (SWBC). The footprint family approach utilized allows measuring overall biophysical loads for the studied region. We quantified regional rates of reliance on imported biophysical services; measured the performances of specific food products grown locally in comparison with their imported counterparts; and identified those commodities that have better and worse local biophysical performances. For the SWBC bioregion, only 35% of the food consumed in the region is locally produced. Supplying the region's food demands requires 2 million hectares of land and 3 billion m3 of water, generating approximately 2.8 million tons of CO2e, with an eco-footprint of 2.5 million gha. Examining a large number of commodities grown and consumed in the bioregion revealed that only some commodities grown locally have absolute or significant biophysical advantages, while the rest have very little to no local advantage. Our analysis challenges the notion that local food systems are necessarily more environmentally sustainable from a biophysical resource use perspective and therefore may not represent the most compelling argument(s) for food system localization. We call for better and more comprehensive comparative analysis of existing and desired food systems as a mean to advance sustainability.

Different forms of urban agriculture have gained increased interest and participation in Germany. One form of urban agriculture is self-harvest gardening where participants can lease a plot in a field with various vegetables. However, in Western Europe, little is known about self-harvest garden participants and providers or their motivation and social background. Therefore, in 2015 a survey was conducted with 173 participants and 34 providers from different regions and cities in Germany. The study aimed to compile a self-characterization of people engaged in this form of gardening on a national level. The outcome of the survey captures an emerging phenomenon. While many of the self-harvest gardens can be assigned as grassroot initiatives, participants generally characterized themselves as having a middle or high income, a sustainable lifestyle, high level of education and high nutritional awareness. Disproportionally often, females were engaged in self-harvest gardening. Providers were mainly farmers with a high affinity to organic agriculture. Often the farmers had synergistic effects with other activities like farm shops. Location of the garden area, good support by the providers, promotional marketing and social activities were identified as factors for successful self-harvest gardens. The main incentive for the participants seem to be their engagement in the production of local and healthy food, which can be taken into account by the providers when considering their future focus. On the other hand, problems with bad harvest, theft and vandalism were challenges for some self-harvest gardens. While, legal problems were not a major concern for the providers.

A study on locally available composts in Austria, Germany, Italy and Switzerland was conducted to investigate the potential of these non-chemical based tools to increase soil health in orchards afflicted by apple replant disease (ARD). A total of 26 different composts (six to seven per country) were chosen for the study. Composts were divided into ten types according to the waste materials used as substrates in the composting process. Growth reduction is the main symptom associated with replant disease; therefore compost performance was evaluated based on the growth responses of apple rootstock plantlets in compost-amended soils in pots. These greenhouse trials were performed in one research station per country, located in an intensive apple-growing area, and soil was taken from an apple orchard affected by replanting disease. Plant growth response was measured as shoot elongation at the end of each greenhouse trial, and results showed increases in growth compared with the respective controls of 2–26% in 20 out of 26 composts evaluated. The heterogeneous nature of the composts most likely attributed to the finding that similar compost types originating from the different countries had varying effects on plant growth. Overall, no significant changes in chemical and biological properties were observed in amended soils as compared with non-amended controls. The high soil resilience was in part expected given the good organic matter content in the original soils (>2%). The bacterial communities of the composts were investigated using the COMPOCHIP microarray, and analyses showed that differences in plant growth response were mainly attributed to the microbial changes introduced into the soil through composts rather than to changes in soil chemical and biological parameters. However, the bacterial communities of composts appeared to be more influenced by geographical origin than by compost type. The results have shown that soil amendment with composts generated from locally produced wastes have the potential to reduce the effects of ARD, although the effects appear to be both compost and soil specific.

If the United Nations Sustainable Development Goals are to be achieved, African smallholder farmers will need to embrace new technologies such as conservation agriculture (CA) in order to increase both their productivity and sustainability. Yet farmers have been slow to embrace CA and when they have, they are inclined to do so at limited intensities. Current investigations tend to apply binary frameworks that classify all utilizations as ‘adoption’, and do not consider in depth the farmer perspectives and contextual realities that affect farmer decision-making on the intensity of use. We analyze 57 in-depth, semi-structured interviews with farmers who implement CA to understand why they tend to do so at limited intensities and what is required to intensify their CA activities, both for them and others within their communities. While most farmers reported substantial yield benefits from using CA, this was mainly related to input intensification (particularly herbicides) and was limited by constrained financial resources. Overall, the intensity of CA utilization was constrained due to farmer-identified constraints across their physical, financial, human and informational resources. Because of this, stagnation at low intensities of CA utilization was common, reflecting the assumed transformational adoption pathway for CA and the focus on binary adoption, as opposed to modification and the broader utilization process. To overcome this, we propose a more nuanced transitional approach focused on the intensification of four broader principles of CA over time [i.e., (1) strategic tillage, (2) soil protection, (3) crop diversification and (4) input management] as opposed to the strict packaging of CA practices. Such a change in approach will foster increased positive perceptions within the community and allow farmers to locally adapt CA to build their own way toward complete CA utilization and with less need for subsidization.

Demonstrated economic benefits of conversion to organic agriculture, combined with solutions to technical and production-related problems, suggest that farmers in Switzerland should have converted in large numbers to organic production. However, the number of organic farms in Switzerland has remained virtually constant in the last 10 yr, so it appears there are other factors that influence the decision of whether or not to convert. Several studies have sought to identify the factors that influence the decisions by farmers whether or not to convert to organic, but have found a range of factors that appear to be context dependent, while others can be seen as context transcendent, which makes it difficult to draw generalizable conclusions. The aim of this study was to identify how Swiss farmers’ decisions reflect the interaction of perceptions, relationships, policies and economic factors, which either enable or provide barriers to conversion. Semi-structured interviews were conducted in 2015 with 39 farmers of mixed and arable farms in the German- (n = 24) and French-speaking (n = 15) parts of Switzerland. The interviews were recorded, transcribed and analyzed according to their content. The results show that the decision of whether or not to convert relies on belief that technical problems have been sufficiently solved, as well as a range of social factors. Farmers perceive social pressure for them to be productive, but non-organic farmers often incorrectly perceive organic farming as not being oriented toward production. Furthermore, ‘official’ advice, which could correct this misperception, is sought about how, rather than whether, to convert and typically comes after farmers have made their decision. Major barriers in an area with a low density of organic farms are the lack of supply and delivery points within an acceptable travel distance, and lack of peer networks to provide informal support. On the basis of these findings, we propose that strategies to encourage conversion should be based around two main pillars: investment to create a network of supply and delivery points in areas with low density of organic farms; and actions, such as information events, to encourage dialogue between conventional and organic farmers to counteract feelings of ‘us vs them’.