Two field experimente were conducted at the Agricultural Research and Experiment Center, Faculty of Agriculture, )4osh-
tohor, Kalubia, Egypt, during 1989 and 1990 seasons to study the
effect of rhizobium inoculation alone or along with different
levels of N fqrtilizer on yield, and its components of two soybean
cultivare (Crawford and Clark).
Crawford cultivar surpassed clark cultivar in plant height,
number of pods and seeds/plant; seed yield/feddan and seed protein
content, However, the two cultivare did no differ significantly in
seed weight/plant, 100-seed weight and seed oil content.
The combined analysis of the two seasons showed that
rhizobium inoculation alone almost produced as much yield as could
be obtained from uninoculated soybeans received 120 Kg N/feddan. In
addition, the application of N at rates of 15 or 30 Kg N/fed, along
with inoculation led to considerabi. increases in seed yield/fed.
and the variou, plant characteristics comparad with inoculation
alone. Further increases in N rates up to 120 Kg N/fed. had no im
proving effect on the inoculated soybeans.
The maximum seed yield/feddan was obtained from Crawford
received 30 Kg N/fed. along with rhizobium inoculation.