Grand Challenges in Waste Management in Agroecosystems

Bernal, M.P.

doi:10.3389/fsufs.2017.00001

Cited by 28 publications

(23 citation statements)

References 30 publications

(34 reference statements)

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“…Typical challenges for waste management in agroecosystems are the improvement on nutrient availability in soil cycling; the development of technologies for nutrient reuse; the mitigation of contaminants and improvement of food safety; the mitigation of environmental emissions; and the enhancement of soil health and function (Bernal, 2017). The implementation of sustainable agro-energy systems integrating bioenergy and crops production is also attracting increasing attention (Siegmeier et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Research Trends on Nutrient Management From Digestates Assessed Using a Bibliometric Approach

Magrí

2018

Front. Sustain. Food Syst.

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Anaerobic digestion is often applied for biological conversion and valorization of organic waste, waste water and other biomass sources as renewable energy and biofuel in the form of biomethane. Composition of the material remaining after digestion, or digestate, is highly dependent on processed feedstocks. This by-product is usually rich in nutrients such as nitrogen and phosphorus, so it is potentially reusable as fertilizer or nutritive broth in agricultural systems. Alternatively, the digestate may need post-treatment based on nutrient removal or recovery strategies. The use of life-cycle assessment tools is becoming popular to analyze nutrient handling scenarios. This study reviews, through a bibliometric-based approach, the research outputs and global trends in the area of knowledge of nutrient management from digestates in the last 30 years, 2017 included. Documentary production followed an upward trend, with a relative productivity in the last 3 years greater than 37% of the total number of appeared publications. China, USA and Spain were the three most prolific countries. The particular interest in nutrient management alternatives and its evolution were identified. Trends for promoting sustainability include low environmental impact, holistic agro-energy solutions, reduced consumption of resources during digestate processing, and circular economy scenarios based on concepts such as (bio)refinery and recovery of valuable and marketable products.

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Section: Introductionmentioning

confidence: 99%

Research Trends on Nutrient Management From Digestates Assessed Using a Bibliometric Approach

Magrí

2018

Front. Sustain. Food Syst.

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“…Materials derived from organic residues, such as compost, can be considered as sources of plant nutrients, for partial substitution of synthetic fertilizers (Flotats et al, 2011;Brockmann et al, 2014), in accordance with the key principles of the Circular Economy (Bernal, 2017). Compost application to soil allows the recycling of nutrients in the soilplant system (Tiquia et al, 2002;Bernal et al, 2009a;Flotats et al, 2011), increasing biomass production and soil fertility by improving the physicochemical and biological properties of the soil (Keener et al, 2000;Loecke et al, 2004;Cordovil et al, 2007;Bedada et al, 2014) as well as nutrient availability (Tejada and Gonzalez, 2006;Biau et al, 2012).…”

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confidence: 99%

“…However, one of the main limitations to compost utilization as organic fertilizer is the fact that the exact amount of N available to plants is not clearly known (Bernal, 2017), which can induce an under-or over-application of N if the compost application rate is based on the total or mineral N content, respectively. Indeed, total N comprises both inorganic forms (mainly nitrate in mature compost; Bernal et al, 2009a), readily available to plants, and organic forms, which need to be mineralized in order to be available to plants (Bernal et al, 1998;Cordovil et al, 2006).…”

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confidence: 99%

Composts Produced From Pig Slurry Solids: Nutrient Efficiency and N-Leaching Risks in Amended Soils

Santos

Fangueiro

Moral

et al. 2018

Front. Sustain. Food Syst.

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“…The second section addressed an option that allowed the respondents to choose whether manure or slurry should be reused as fertilizer. There were also five options in terms of "needs" and five in terms of "barriers, " and the respondents could choose one or multiple answers (Bernal, 2017;Case et al, 2017;Hou et al, 2018). The response options were selected based upon previous studies and tested by experts in the field of manure management (Salazar et al, 2007(Salazar et al, , 2010Asai et al, 2014;Palhares, 2014;Vankeirsbilck et al, 2016;Charlón et al, 2017b;Palhares et al, 2017).…”

Section: Survey Questionnaire and Data Collectionmentioning

confidence: 99%

“…The generation of high amounts of manure in concentrated areas from livestock production systems requires adequate on-farm and off-farm management. In several countries, an equilibrium between the amount of manure produced and the availability of an agricultural area to recycle this manure is difficult to achieve (Bernal, 2017). However, in most South American countries, dairy intensification is a rather recent process, and the relationship between the amount of manure and crop area is more suitable.…”

Section: Introductionmentioning

confidence: 99%

Dairy Manure Management Perceptions and Needs in South American Countries

Herrero

Palhares

Salazar

et al. 2018

Front. Sustain. Food Syst.

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Milk production is important in South American countries being based mainly on grazing systems. Dairy slurry management has become an important issue in these production systems because of the large volumes produced and the environmental effects. Thus, manure management regulations are emerging in the region. This research aims to identify priorities for management strategies and technology transfer by assessing perceptions, needs and barriers toward dairy manure management by stakeholders in South American countries. A questionnaire was prepared and distributed in Spanish and Portuguese in different formats: on paper and online (PDF format and SurveyMonkey TM platform) between March 2015-November 2017. It was divided into two sections, the first addressed issues related to water quality and pollution, odor generation, fertilizer value, pathogens impact and biogas production. Responses were measured across a standard 5-point Likert type scales. Section two addressed needs and hindrances concerning about manure application. A total of 593 surveys were completed: Argentina (n = 308, 52%), Brazil (n = 217, 37%) and Chile (n = 68, 11%). The majority of respondents were dairy farmers (31%), professional advisors and consultants (29%) and representatives of public institutions and researchers (31%). Some differences appear according the country. Overall, a large majority perceive that manure is a good fertilizer (91%), also they believe that it contributes to pathogen's transmission and groundwater and shallow aquifers 'contamination. Stakeholders (60%) perceived biogas production as a good option for manure treatment. Most of respondents (79%) would use manure to replace mineral fertilizers, with little differences between countries (Argentina 79%, Brazil 80% and Chile 68%). The most selected needs were: a management handbook, increased investment in equipment and technologies and better access to laboratory analysis. The most chosen barriers were: cumbersome management, lack of knowledge and of specific laws, with differences between countries and respondents. The survey showed interest in dairy manure management as a source of nutrients for grassland and crops, especially among farmers and advisors whom requested Herrero et al.South American Dairy Manure Management Perceptions guidelines for responsible management. Policymakers and stakeholders should focus on promoting manure reuse on dairy farms through incentives, technologies and/or appropriate strategies, in order to improve nutrient use and reduce pollution to the wider environment.

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Grand Challenges in Waste Management in Agroecosystems

Cited by 28 publications

References 30 publications

Research Trends on Nutrient Management From Digestates Assessed Using a Bibliometric Approach

Research Trends on Nutrient Management From Digestates Assessed Using a Bibliometric Approach

Composts Produced From Pig Slurry Solids: Nutrient Efficiency and N-Leaching Risks in Amended Soils

Dairy Manure Management Perceptions and Needs in South American Countries

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