Data/hora: 09/06/2024 16:45:04

Provedor de dados: | 65
País: | Brazil
Título: | Expolinear model on soybean growth in Argentina and Brazil
Autores: | Confalone,Adriana Elisabet; Bernardes,Marcos Silveira; Costa,Luiz Claudio; Righi,Ciro Abbud; Dourado Neto,Durval; Martin,Thomas Newton; Manfron,Paulo Augusto; Pereira,Carlos Rodrigues.
Data: | 2010-05-01
Ano: | 2010
Palavras-chave: | Water deficit; Solar radiation; Temperature; Phenological phase.
Resumo: | Predicting crop growth and yield with precision are one of the main concerns of the agricultural science. For these purpose mechanistic models of crop growth have been developed and tested worldwide. The feasibility of an expolinear model for crop growth was evaluated on predicting growth modification on soybean (Glycine max L. Merrill) of determined and undetermined growth cultivars, submitted to water restrictions imposed on different phenological stages. An experiment was carried out in Azul/Argentina and in Viçosa/Brazil during the growing seasons (1997/1998, 1998/1999 and 2002/2003). The expolinear model was adjusted to the dry-matter data obtained from each treatment. The model showed sensibility of Rm (maximum relative growth rate of the culture - g g-1 day-1) to variation in air temperature; of Cm (maximum growth rate of the culture - g m-2 day-1) to solar radiation and of Tb (lost time -day) to water stress. Cm values were higher without water restriction presenting, in both countries, a direct correlation with solar radiation. Without water restrictions, Rm values were lower when the average air temperature during the cycle was lower. It was observed that under water stress the culture had a bias to present higher Rm values. Tb was lower in the irrigated treatments than in those with water deficits. The analysis of the outputs clearly shows the feasibility of the expolinear model to explain the differential growth rates of soybean as a consequence of climatic conditions.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010000500002
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/S0103-84782010000500002
Formato: | text/html
Fonte: | Ciência Rural  v.40 n.5 2010
Fonte: | info:eu-repo/semantics/openAccess