Data/hora: 09/06/2024 11:37:25

Biblioteca(s): | Embrapa Arroz e Feijão.
Data corrente: | 31/10/2013
Data da última atualização: | 31/10/2013
Autoria: | FAGERIA, N. K.; MOREIRA, A.; CASTRO, C.; MORAES, M. F.
Afiliação: | NAND KUMAR FAGERIA, CNPAF; ADONIS MOREIRA, CNPSO; CESAR DE CASTRO, CNPSO; M. F. MORAES, UNIVERSIDADE FEDERAL DE MATO GROSSO, Barra do Garças.
Título: | Optimal acidity indices for soybean production in brazilian oxisols.
Ano de publicação: | 2013
Fonte/Imprenta: | Communications in Soil Science and Plant Analysis, New York, v. 44, n. 20, p. 2941-2951, 2013.
ISSN: | 0010-3624
DOI: | 10.1080/00103624.2013.829484
Idioma: | Inglês
Conteúdo: | Soybean is an important crop for the Brazilian economy, and soil acidity is one of the main yield-limiting factors in Brazilian Oxisols. A field experiment was conducted during three consecutive years with the objective to determine soybean response to liming grown on Oxisols. Liming rates used were 0, 3, 6, 12, and 18 Mg ha&#8722;1. Liming significantly increased grain yield in a quadratic trend. Ninety percent maximum economic grain yield (2900 kg ha&#8722;1) was achieved with the application of about 6 Mg lime ha&#8722;1. Shoot dry weight, number of pods per plant, and 100-grain weight were also increased significantly in a quadratic fashion with increasing liming rate from 0 to 18 Mg ha&#8722;1. These growth and yield components had a significant positive association with grain yield. Maximum contribution in increasing grain yield was of number of pods per plant followed by grain harvest index and shoot dry weight. Uptake of nitrogen (N) was greatest and phosphorus (P) was least among macronutrients in soybean plant. Nutrient-use efficiency (kg grain per kg nutrient accumulation in grain) was maximum for magnesium (Mg) and lowest for N among macronutrients. Application of 3 Mg lime ha&#8722;1 neutralized all aluminum ions in soil solution. Optimal acidity indices for 90% of maximum yield were pH 6.0, calcium (Ca) 1.6 cmolc kg&#8722;1, Mg 0.9 cmolc kg&#8722;1, base saturation 51%, cation exchange capacity (CEC) 4.8 cmolc kg&#8722;1, Ca/Mg ratio 1.9, Ca / potassium (K) ratio 5.6, and Mg/K ratio 3.0.
Thesagro: | Acidez do solo; Fertilidade do solo; PH; Soja.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Arroz e Feijão (CNPAF)
Exemplares: | CNPAF - (32372-1) - UPC - AP - DD - 2013.063 -  - 2013.063 - DIS