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چکیده
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To evaluate the effect of using mycorrhizae and rhizobium at different levels of nitrogen starter fertilizer on some important growth indices of a common bean cultivar, a factorial experiment was conducted in a randomized complete block design with three replications in 2016 at Bu-Ali Sina University research farm. The factors included two bio-fertilizers of mycorrhizae (Glomus mosseae) and rhizobium (Rhizobium phaseoli) each one with two levels (used and non-used) and nitrogen starter fertilizer with three levels (0, 30, 60 kg ha−1) from urea as the third factor. The studied factors caused significant changes in growth indices. The maximums of leaf area index (5.9), total dry weight (860 g m−2) and crop growth rate (44 g m−2 day−1) were observed in the simultaneous application of both biofertilizers plus use of 60 kg ha−1 N. This superior treatment compared with no bio-fertilizer þ 60 kg ha−1 N treatment increased maximums of LAI, TDM and CGR, 115, 68 and 60%, respectively. Also in superior treatment, the two indices of net assimilation rate (NAR) and relative growth rate (RGR) on 60th day after planting were 25 g m−2 day−1 and 0.046 g g−1day−1, that were respectively 116 and 17% higher than no bio-fertilizer þ 60 kg ha−1 N treatment. Therefore application of mycorrhiza and rhizobium simultaneously in addition to 60 kg ha−1 N as starter fertilizer is an appropriate treatment in common bean to maximize the growth indices.
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