Abstract:
Field experiment was conducted for one growing season(2009/2010)in the
Demonstration Farm of College of Agricultural Studies at Sudan University
of Science & Technology at Shambat to investigate the effect of sowing date
on two Soybean genotypes (Glycine max L.),G1, 1904- 5E(E)and G2, 1905
-2E(M) on growth, yield and yield components. Lay out of experiment was
split block design with four replications, growth parameters were number of
leaves, plant height, yield and yield components (50% and 100% flowering,
weight of pods/plant, number of seeds/pod, number of seeds/plant, shoot dry
weight 100 seeds weight, weight of seeds/plant and harvest index). Fourth
reading every fifteen days (30, 45, 60, 75 days after sowing) showed
significant difference only in first reading (30 days) at first sowing date. The
result showed that time of flowering was significantly effect by sowing date
and genotype. Late sowing date resulted in early days of flowering. Yield
components (weight of pods/plant, number of seeds/ pod, numbers of seeds/
plant shoot dry weight) and yield (kg/ha) revealed highly significant
difference in sowing date only. While 100 seeds weight, weight of
seeds/plant and harvest index showed no significant differences may be the
former two parameters are genetically controlled. In conclusion, the first
sowing date at July 2 was the best sowing date for growing soybean in this
climatic zone of Sudan according to the above finding. G2 (1905) was
favorite than G1 (1904) but without clear significant evidence. The
interaction between sowing date and genotypes also gave superiority to S1G2
for all parameters with slight difference among treatments.