Effect of Phosphorus Bio-fertilizers and Chemical on Element Accumulations, Chlorophyll Content, Seed Yield and Root Growth of Three Local Mung bean (Vigna radiata L.) Populations

To investigate the effects of chemical and phosphorus bio-fertilizers on element accumulations, chlorophyll content, seed yield and root growth of three local populations of mung bean, a factorial experiment based on a randomized complete block design with three replications was carried out at the Research Farm of Agricultural Faculty of Ilam University, Ilam, Iran, in 2015. The treatments were three local populations of mung bean (Fereydouni, Arteshi, Gotvandi), chemical fertilizer with three levels: (without using fertilizer (P0), using 75 kg.ha-1 of super phosphate (P75) and 150 kg.ha-1 of super phosphate (P150) and bio-fertilizer with two levels: without using fertilizer (B0) and using 100 g.ha-1 of barvar-2 phosphate (B100). Result showed that application of bio-fertilizer and chemical phosphorus (75 and 150 kg.ha-1 of super phosphate) increased phosphorus, nitrogen, and potassium in seeds and root dry weight of mung bean. Application of bio-fertilizer increased phosphorus and nitrogen contents of three local populations of mung bean. Highest contents of zinc and iron in seed, leaf chlorophyll, number of nodules and root dry weight belonged to Arteshi population. Zinc concentration, chlorophyll and number of nodule in roots increased by using bio-fertilizer. Application of chemical phosphorus (75 and 150 kg.ha-1 super phosphate) increased chlorophyll content of leaves and number of nodule in root of mung bean. Application of both bio-fertilizer and chemical phosphorus increased seed yield of Fereydouni, Arteshi, and Gotvandi by 32.33, 64.87 and 81.35 percents, respectively, as compared to that of control. It can be concluded that reduced application of chemical and phosphorus bio-fertilizers improves the yielding ability of mung bean.