Evaluation of soybean cultivats growth analysis effected from Rhizobium japonicum strains

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.