Influence of planting date on some genotypes of soybean growth, yield and seed quality

Abstract

Planting date affects different growth stages as one of the important factors in determining maximum cultivar Delaying planting date and unfavorable environmental conditions have a negative effect on soybean growth, development and yield. Four separate experiments were carried out in each season at the experimental farm of Sakha Research Station, Kafr El-Sheikh during 2010 and 2011 summer seasons to evaluate seed quality and growth of six soybeans genotypes i.e. Giza 21, Giza 22, Giza 111, H2L12, H30 and H32 under different planting dates i.e., 20th April, 5th May, of 20th May and 5th June. Planting on 5th May recorded highest values in all studied characters, except highest values of crop growth rate and net assimilation rate was obtained from planting on 5th June. Giza 21 cultivar was consistently produced higher 100-seed weight, seed yield (t ha-1), protein and oil yields (kg ha-1) than those of other genotypes. H30 line had a consistently higher rate of vegetative abscission and a generally lower 100-seed weight, seed, protein and oil yields (kg ha-1) than other genotypes. Delaying planting until 5th June altered vegetative stage significantly increase with the line H30 of crop growth rate and net assimilation rate and the same line H30 gave the high rate of relative growth rate and leaf area index on 5th May. Planting in the first May is an effective management strategy to increase soybean yield in Egypt. © 2013 Asian Network for Scientific Information.