Planting date in soybean I. Effects on yield and yield components

Abstract

The aim of the present research was to study effects of planting dates on grain yield and it's components for three soybean cultivars Glycine max (L.) Merrill). The experiments were grown under field conditions of Botucatu, São Paulo State, Brazil (22º 51'S latitude and 48º 27'W.Gr. longitude) on a soil classified as 'Terra Roxa Estruturada". Soybean cultivars Paraná, Santa Rosa and UFV-1 were sown fortnightly in six planting periods, starting in October, and repeated for three years (1977/78, 1978/79 and 1979/80). The following traits were evaluated: seed yield (kg/ha), number of pods per plant, percentage of normal pods, number of seeds of normal pods and weight of 100 seeds. Highest seed production were obtained on the second fortnight of October and during November sowing dates. Number of pods per plant and weight of 100 seeds were the yield components that were most affected by sowing dates.