Data/hora: 09/06/2024 11:26:36

Biblioteca(s): | Embrapa Soja.
Data corrente: | 20/04/2000
Data da última atualização: | 15/10/2004
Autoria: | BORKERT, C. M.; GAUDENCIO, C. A.; PEREIRA, J. E.; OLIVEIRA, JR. A. de.
Título: | Recycling of mineral nutrients in biomass of cover crops in no-tillage crop rotation systems in Southern Brazil.
Ano de publicação: | 1999
Fonte/Imprenta: | In: WORLD SOYBEAN RESEARCH CONFERENCE, 6., 1999, Chicago. Proceedings: invited and contributed papers and posters. Chicago: University of Illinois / Soybean Research & Development Council, 1999.
Páginas: | p.607.
Idioma: | Inglês
Conteúdo: | The area of no tillage soybean has expanded greatly in the last several years in the state of Parana, however, in these areas the use of crop rotation in still small. The quantity of fertilizer recommended for no tillage should be less than for a conventional system where soil is tilled, due to recycling of nutrients from cover crops which can be grown before cash crops in a crop rotation system. However, there is little information on the quantity of mineral nutrients contributed by cover crops from mineralization of their residues. The objective of this research was to estimate the quantity of nutrients recycled by five species of cover crops. Aerial biomass samples of black oat (Avena strigosa Schreb), black mucuna (Stizolobium aterrimum Piper & Tracy), pigeon pea (Cajanus cajan (L.) Millsp), blue lupin (Lupinus angustifolius L.) and common vetch (Vicia sativa L.) were taken to estimate dry matter yield and content of N, P, K, Ca, Mg, Mn, Zn, and Cu. Crop rotation experiments were carried out from 1984 to 1994, in Londrina, Campo Mourao and Guarapuava in the state of Parana. For each species regression equations were developed for the quantity of recycled nutrients as a function of dry matter, separated into  four to six weight classes based on the range of dry matter production. The adjusted equations were used to estimate the mean value ad confidence interval of the quantity of each nutrient for each class of dry matter yield level. Tables were built to show for each class of dry matter yields, the quantity of nutrients, which were recycled. Black oat and common vetch proved to be good recycling plants for K, while common vetch, black mucuna, blue lupin and pigeon pea recycled large amounts of N. All species recycled large amounts of Ca, Mg and micronutrients but small amounts of P. This research demonstrates the benefit of cover crops used in rotation to reduce fertilizer inputs as well as to reduce erosion and improve soil quality. It also provides quantifiable recommendations for improved fertilizer management for no-tillage soybean systems in the subtropics.
Palavras-Chave: | Semeadura direta; Soybean; Zero tillage.
Thesagro: | Rotação de Cultura; Soja.
Thesaurus Nal: | Brazil; crop rotation.
Categoria do assunto: | --
Registro original: | Embrapa Soja (CNPSO)
Exemplares: | CNPSO - (17451-1) - UPC - PL - -- - 633.34072 - W927p -  - DIS