Evaluation of the plasticity of soybean (Glycine max (L.) Merrill) under effect of variability of space arrangements. / Plasticidade da cultura da soja (Glycine max (L.) Merril) em diferentes arranjos espaciais.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

This research had as purposes to evaluate the soybean plant adaptations (plasticity) to different space arrangements and identify the best space arrangements for higher yields of cultivar MG/BR 46 (Conquista). The experiment was carried out at the experimental fields of Escola Superior de Agricultura "Luiz de Queiroz" (USP/ESALQ), São Paulo State University, in Piracicaba-SP, during the 2001/2002 growing season. The 30 treatments consisted of different space arrangements, combining 6 row spacing (0,20; 0,30; 0,40; 0,50; 0,60; 0,70 m) with 5 different population (70.000; 140.000; 210.000; 280.000; 350.000 plants/ha), in a complete randomized blocks design with subdivided plots and three replications. The evaluated characteristics were: time to achieve closed canopy; leaf area index; final plant height; height of the first pod; number of branches per plant; number of pods per plant; number of grains per plant; lodging; mass of 1,000 grains and yield. The main conclusions are: a) the cultivar MG/BR – 46 (Conquista) cultivated under 0,20 to 0,60 m row spacing shows a leaf area index maximum at the begging of seed-filling stage (R5); b) the number of pods is the best related component to yield per plant, being directly influenced by plant population; c) the cultivar MG/BR – 46 (Conquista) presents wide plasticity, adjusting its yield components to the different space arrangements, without significant yield changes; d) for each row spacing there is a better plant population to achieve higher yield.

ASSUNTO(S)

espaçamento produtividade agrícola soja densidade da planta yield plant population população de plantas spacement soybean plant density

ACESSO AO ARTIGO

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