Grass–legume intercropping in integrated crop-livestock systems: a strategy to improve soil quality and soybean yield in the Brazilian Cerrado

Moraes, Juliana M. A. S.; Denardin, Luiz Gustavo de Oliveira; Pires, Gabriela Castro; Gonçalves, Evelyn Custódio; Silva, Laércio Santos; Pacheco, Leandro Pereira; Wruck, F. J.; Carvalho, Paulo César de Faccio; Souza, Edicarlos Damacena de

doi:10.21203/rs.3.rs-831197/v1

Cited by 2 publications

References 61 publications

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Grass-legume intercropping systems in rotation with soybean crops: C and N stocks and CO 2 and NH 3 emissions

Pinaffi

Moreira

Mignacca

et al. 2023

Preprint

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Understanding factors that contribute to carbon dioxide (CO2) losses and ammonia (NH3) volatilization in agricultural soils, mainly in sandy soils, is essential for determining strategies to decrease emissions of these gases and improving carbon (C) and nitrogen (N) stocks in the soil. The objective of this study was to quantify C and N inputs to the soil and CO2 and NH3 emissions in a crop-livestock integration system composed of pastures with grass-legume intercropping and N fertilizer application. The experiment was carried out in a Typic Hapludox, evaluating three consecutive soybean crops grown in rotation with the following pasture systems: mombaca grass (Panicum maximum cv. Mombaca) with N fertilizer (M + N); mombaca grass without N fertilizer (M-N); mombaca grass intercropped with the forage legume pigeon pea (Cajanus cajan) (M + G); and mombaca grass intercropped with the forage legume java (Macrotyloma axillare cv. Java) (M + J). Soil samples were collected at the beginning and end of each crop and analyzed for total C (TCS) and N (TNS) stocks. NH3 volatilization and CO2 emissions were evaluated every 15 days, with simultaneous evaluations of soil moisture and temperature. Soybean rotation with grass-legume intercropping or grass with mineral fertilizer application improved N and C inputs to the agricultural systems, although there were losses in CO2 and NH3. The M + G and M + J intercrops after soybean crops increased NH3 volatilization, whereas the use of M + N tended to decrease it. The soil moisture affected the C and N input-output balance in the production systems evaluated.

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Grass-legume intercropping systems in rotation with soybean crops: C and N stocks and CO 2 and NH 3 emissions

Pinaffi

Moreira

Mignacca

et al. 2023

Preprint

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Ecological Management of the Nitrogen Cycle in Organic Farms

Valenzuela

2023

Nitrogen

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Nitrogen availability is among the major limiting factors for the production of organic crops. A central goal of organic farming, according to certification standards, is to rely on ecological and biological principles to build and maintain soil health. Nitrogen is among the most complex nutrient elements with respect to its different chemical forms and its flow within the environment at the soil, microbial, plant, aquatic, and atmospheric levels. Because, from an ecological perspective, all production variables on the farm are interrelated, a challenge for scientists and practitioners is to better understand nutrient cycles on the farm with respect to how particular production practices may improve N availability during particular stages of crop growth while minimizing potential environmental losses that may lead to contamination of the groundwater and aquatic habitats or to undesirable greenhouse gas emissions. Here, based on a selected review of the literature, we evaluate N cycles at the farm level and present key ecologically-based management strategies that may be adopted to improve internal N cycles. Given the location-specific nature of most ecosystem interactions, a participatory agroecology approach is proposed that incorporates the knowledge of indigenous and traditional cultures to better understand and design resilient and socially-equitable organic systems.

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Grass–legume intercropping in integrated crop-livestock systems: a strategy to improve soil quality and soybean yield in the Brazilian Cerrado

Cited by 2 publications

References 61 publications

Grass-legume intercropping systems in rotation with soybean crops: C and N stocks and CO 2 and NH 3 emissions

Grass-legume intercropping systems in rotation with soybean crops: C and N stocks and CO 2 and NH 3 emissions

Ecological Management of the Nitrogen Cycle in Organic Farms

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