Effect of different levels of n p k and rhizobium on soil physico-chemical properties and yield attribute of green gram (Vigna radiata l.) var. hum-2

Abstract

The field experiment was carried out at soil science research farm of Sam Higgin bottom University of Agriculture, Technology and Sciences, Praygraj during summer season 2017-18.The design applied was 3x3 factorial randomized block design having three factors with three levels of NPK @ 0, 50, and 100 % ha-1, three levels of Rhizobium @ 0, 50 and 100% ha-1 respectively. The result obtained with treatment T8-[NPK@ 50% + Rhizobium @ 100%] that showed the highest yield regarding, gave the best results with respect to plant height 60.16 cm, number of leaves plant-1 33, No. of pod plant-1 38.77, it gave highest yield 12.10 q ha-1. The maximum cost benefit ratio was recorded 1: 2.29 and net profit. rs. 20843.2ha-1 in treatment combinationT8-L2M2 [@ 100% NPK ha-1+ 100% Molybdenum ha-1] combined use of NPK resulted in significant increase on enrichment of soil fertility status. Rhizobium in combination resulted in a slight increase in pH 7.24, EC 0.26 dSm-1. In post soil of NPK fertilizers observations were resulted in significant increase in OC 0.77 %, Particle density 2.60 g/cm3, Bulk density 1.24 g/cm3,Porespace 56.22% and available N 337.32 kgha-1, P 35.62 kg ha-1, K 205.54 kg ha-1, significant increase in case of Nitrogen (kg ha-1), Phosphorus (kg ha-1), Potassium (kg ha-1) was found to be significant among other treatments in Green gram cultivation and soil quality improvement. It was also revealed that the application of NPK with Rhizobium were excellent source for fertilization than fertilizers. The treatment (T8) also showed greater benefit cost ratio followed by other treatments.