عنوان مقاله [English]
To investigate adaptation and effects of the different strains of Rhizobium japonicum on soybean cul ti var
and selective of the best cultivar and bacteria strain, an experiment was carried out in Broujerd agriculture research station. A factorial design with 4 replications in the basis of randomized complete block was applied. Treatments included three cultivars of soybean (Clark, Williams and Zien) and two kinds of bacteria strain (Helinitro and Rizoking) and a level without bacteria strain (Control). To determine growth analysis, total dry matter (TOM), leaf dry matter (LOW) and leaf area index (LAI) were measured, and with three parameters other growth indexes were calculated. The results achieved showed that Williams cultivar and Helinitro bacteria strain ('' ith high level of nitrogen fixation) had better grain yield and nitrogen fixation efficiency than other cultivars and strains. These results obtained through increasing of the crop growth rate (CGR) and leaf area index (LAI), which these factors increased net assimilation rate (NAR) and total dry matter (TOM). The control plot leaf area index and crop growth rate were very low; consequently, net assimilation rate and total dry matter decreased and grain yield produced very low.