Vol. 13 No. 3
Influence of irrigation and plant growth promoting substances on yield, nitrogen balance and economy of mung bean grown at dry to wet transition
Author(s): M. Marasini, C. P. Shriwastav, B. R. Khanal and S. Dhakal
Abstract: A field experiment was conducted at the research farm of Regional Agriculture Research Station (RARS), Khajura to evaluate appropriate irrigation levels and nutrient management options that could either conserve or enhance the nitrogen nutrition of soil along with mung bean productivity during dry-wet transition period in the existing rice-potato cropping pattern. Under the sub-tropical climate of Nepalgunj, the experiment was started in February 2016 in split plot design with two levels of irrigation i.e. irrigated vs unirrigated as the main factors and 6 nutrtient management practices i.e. control, recommended dose NPK, seed treatment with only Rhizobium spp, seed treatment with Rhizobium spp. and recommended dose NPK, recommended NPK with seed pelleting with Rhizobium spp. and Tricoderma spp. and system of crop intensification practice (SCI) with recommended NPK with seed pelleting with Rhizobium spp. and Tricoderma spp. as sub factors. Grain yield (1.12 t ha-1) and biological yield (7.25 t ha-1) of mung bean was significantly higher in mung bean irrigated twice at vegetative and flowering stage as compared to the unirrigated condition where grain and biological yield was 0.87 t ha-1and 6.22 t ha-1respectively. Considering the nutrient management practices, grain yield (1.21 t ha-1) and biological yield (7.31 t ha-1) obtained was significantly higher under mungbean seed treated with both Rhizobium spp. and Tricoderma spp. which is found to be 42.35 and 19 per cent higher than current pattern of mung bean cultivation as practiced by farmers in this region. The total nitrogen in soil and plant (27.65 Kg ha-1) was found significantly higher in plots with irrigation and seed treated with Rhizobium and Tricoderma spp grown under SCI system while least was observed in control plots (21.52 Kg ha-1). The highest nitrogen economy through treatment combination (24.47 Kg ha-1) was observed in plots with no irrigation and seed treated with Rhizobium spp. and Tricoderma spp The study concluded that application of two irrigation one at vegetative stage and the other at flowering stage along with seed pelleting with Rhizobium spp. and Tricoderma spp. would be imperative to increase soil fertility, nitrogen economy and yield of mungbean.
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