Data/hora: 16/06/2024 07:22:16

Biblioteca(s): | Epagri-Sede.
Data corrente: | 12/05/2009
Data da última atualização: | 12/05/2009
Autoria: | DINIZ, E.R. ; SANTOS, R.H.S.; URQUIAGA, S.S.; PETERNELLI, L.A.; BARRELLA, T.P.; FREITAS, G.B. de
Título: | Green manure incorporation timing for organically grown broccoli.
Ano de publicação: | 2007
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, v.42, n. 2, p.199-206, fev. 2007.
Idioma: | Inglês
Conteúdo: | The objective of this work was to determine the effect of incorporation timing of the velvet bean (Stizolobium cinereum) (GM) on both organic broccoli yield and N status. Mineral N content in the soil, biologically fixed N recovery by broccoli, GM biomass decomposition and N release kinetics were also determined. Plots were fertilized with 12 Mg ha-1 of organic compost and received GM either at 0, 15, 30 or 45 days after transplant. Other treatments were compost (12 or 25 Mg ha-1), GM, mineral fertilizers and control (no fertilizer). The data were collected in four completely randomized blocks. GM decomposition increased mineral N content in soil as rapidly as mineral fertilizer or the supply of 25 Mg ha-1 of compost. The N half-life in GM (24 days) is smaller than the mass half-life (35 days) and the biological fixation contributed with 23.6% of N present in the aboveground biomass of broccoli. The result suggests a higher synchrony between the crop relative growth rate and N release from the GM when incorporated at crop early growth stage. The incorporation of GM until 15 days after transplanting replaces 50% of the highest compost dose, without yield loss.
Palavras-Chave: | Biological nitrogen fixation; Brassica oleracea; Brocoli; Ciltivo orgânico; Decomposition rate; Fixação biológica do nitrogênio; N recovery; Recuperação de nitrogênio; Stizolobium cinereum; Taxa de decomposição.
Categoria do assunto: | --
Registro original: | Epagri-Sede (Epagri-Sede)