ABSTRACT
Two field experiments were carried out in the experimental farm of
Barrage Horticulture Research station of the Agricultural Research Center,
Qalubia Governorate, Egypt. during two summer seasons of 2017 and 2018
to study the effect of sowing date (1st April, 1st May and 1st June) on two
cultivars of vegetable soybean (K173 - Royston Petrie).The experimental
design was a split plot design the main plots were the three sowing dates and
the sub plots were the two vegetable soybean cultivars. The results indicated
that the third date (1st June) gave the highest values in plant length in the
both seasons, number of leaves/ plant and number of branches/ plant in the
first season. And the first sowing date (1st April) significantly increased the
100 green seeds weight and net ratio of green pods in both seasons too. But
the second sowing date (1st May)) gave a significant effect on green pod
number of green pod / plant, total yield of green pod (ton/ Fed) and gave
significantly increased in the total sugars content in green seeds in the both
seasons. The K173 cv. gave the highest number of green pod/ plant, total
yield of green pod (ton/ Fed), % Potassium and the total sugars content in
green seeds in the first and the second seasons, % phosphorus contents in
green seeds in the first season. However Royston Petrie cv. recorded
significant effect in number of nods to first pod, green pod weight, net ratio
of green pods, % nitrogen and % protein in green seeds in the first and the
second seasons. K173cv. which sowing in the third date (1st June) gave the
highest plant length, number of leaves/ plant, number of branches/ plant and
stem length in both seasons. Also K173cv.with second sowing date (1st
May) gave the highest number of green pod/ plant, total yield of green pod
(ton/ Fed) in the first and the second season. However The Royston Petrie
cv. gave highest number of nods to first pod with the third sowing date (1st
June) in the first season. Sowing the Royston Petrie cv. in the first sowing
date (1st April) significantly increased green pod weight and net ratio of
green pods in both seasons