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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Nitrate leaching in soybean rotations without nitrogen fertilizer

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Autor(es):
Rosolem, Ciro A. [1] ; Castoldi, Gustavo [1] ; Pivetta, Laercio A. [1] ; Ochsner, Tyson E. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Sao Paulo State Univ, Coll Agr Sci, Botucatu, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: PLANT AND SOIL; v. 423, n. 1-2, p. 27-40, FEB 2018.
Citações Web of Science: 1
Resumo

Nitrate leaching is a primary pathway of nitrogen loss from agricultural systems, and is affected by both tillage and cropped species. However, there is little information on conservation systems without nitrogen fertilization. Nitrate leaching was assessed in soybean (Glycine max) cropped in rotation with the following cover crops under no-till and chiseling: ruzigrass (Brachiaria ruziziensis), grain sorghum (Sorghum bicolor), pearl millet (Pennisetum glaucum), forage sorghum (Sorghum bicolor), Sunn hemp (Crotalaria juncea), triticale (X Triticosecale) and sunflower (Helianthus annuus). Ruzigrass and grain sorghum cropped in the fall/winter resulted in similar NO3 (-) leaching, which was greater under sunflower than under triticale, likely due to high N uptake and immobilization in plant residues. Sunn hemp as a spring crop resulted in higher NO3 (-) leaching than pearl millet at two locations and forage sorghum at one location likely due to a higher N input by biological fixation. Millet resulted in the lowest N leaching by depleting the soil solution. Chiseling/fallow resulted in higher nitrogen leaching as compared with non-fixing N cover crops. Even when N is not applied, it is important to intensify cropping systems in tropical environments using cover crops with vigorous root systems and high N demand, which prevent N leaching, as well as provides N to the following crop as the straw is mineralized. (AU)

Processo FAPESP: 11/02117-7 - Ciclagem do nitrogênio em sistemas de produção
Beneficiário:Ciro Antonio Rosolem
Linha de fomento: Auxílio à Pesquisa - Regular