Consulta: subjectFacets:"N balance"
Registros recuperados: 2
Data/hora: 05/06/2024 13:35:31

Nitrogen fixation by groundnut and velvet bean and residual benefit to a subsequent maize crop
Provedor de dados: 86
Autores: Okito,Ambate; Alves,Bruno José Rodrigues; Urquiaga,Segundo; Boddey,Robert Michael.
Chemical fertilisers are rarely avaiable to poor farmers, for whom the nitrogen (N) is often the most limiting element for cereal grain production. The objective of this study was to quantify the contribution of biological nitrogen fixation (BNF) to groundnut (Arachis hypogaea) and velvet bean (Mucuna pruriens) crops using the 15N natural abundance (delta15N) technique and to determine their residual effect and that of a natural fallow, on growth and N accumulation by two rustic maize varieties. The contribution of BNF calculated from delta15N data was 40.9, 59.6 and 30.9 kg ha-1, for groundnut, velvet bean and the natural fallow, respectively. The only legume grain harvested was from the groundnut, which yielded approximately 1.000 kg ha-1. The subsequent...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arachis hypogaea; Mucuna pruriens; Zea mays; 15N natural abundance technique; Green manures; N balance; Small-holder producers.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004001200004

Contribution of nitrogen from sugarcane harvest residues and urea for crop nutrition
Provedor de dados: 63
Autores: Fortes,Caio; Vitti,André Cesar; Otto,Rafael; Ferreira,Danilo Alves; Franco,Henrique Coutinho Junqueira; Trivelin,Paulo Cesar Ocheuze.
Sugarcane (Saccharum spp.) harvested without burning provides a substantial amount of remains (trash) on soil profiles which can be decomposed and release nutrients contributing to reduce fertilizer needs. The contribution of nitrogen (N) from sugarcane plant residues and fertilizer in sugarcane nutrition was assessed. Plant cane treatments were micro plots of 15N-labeled urea, sugarcane trash and root system; the last two to simulate the previous crop residues incorporated into the soil after crop renewal. For ratoons, N-ammonium nitrate (N-AN) micro plots, 150 kg ha-1 of N-AN and control (0 kg ha-1) were set up to evaluate the contribution of trash in N supply and quantify the effects of N-fertilizer on N-trash mineralization. The N balances derived from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; 15N isotope; N balance; Urea; Straw; Roots and rhizomes.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500005