Effect of plant density to absorb radiation use efficiency of common bean (Phaseolus vulgaris L.) cultivars

چکیده مقاله

In order to determine the effect of different plant densities in bean cultivars, an experiment was conducted as factorial layout based on a randomized complete block design with three replications. Factors included four bean cultivars (such as Akhtar, D-81083Line, Naz and Goli), and three plant densities (including 13.3, 20 and 40 plants.m^-2). some indicators including leaf area index (LAI), amount of absorbed radiation, dry matter accumulation and radiation use efficiency (RUE) in bean cultivars at different plant densities. The trend of increasing dry matter accumulation in all cultivars entered to the linear growth phase on the 20^th day after planting and reached to its maximum on the 70^th day after planting. The highest dry matter was obtained in Goli (300.4 g.m^-2) and Naz (285.1 g.m^-2). The highest radiation use efficiency (2.2 g.MJ^-1) was obtained in treatment at density of 40 plants.m^-2 and was in Goli (2.01 g.MJ^-1) and Naz (1.98 g.MJ^-1) cultivars. This result can be used for modeling of leaf area. With increasing plant density due to increasing of leaf area index, the amount of absorbed radiation increased and therefore the time to reach maximum dry matter accumulation decreased and dry matter accumulation increased.

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