EFFECT OF INTEGRATED NUTRIENT MANAGEMENT ON SYMBIOTIC EFFICIENCY AND SOIL FERTILITY UNDER GREEN GRAM [VIGNA RADIATA (L.) WILCZEK] CULTIVATIONK.K. YADAV, M.K. MEENA, N.L. MALI AND JARIPITI TRIVIKRAMA RAJU
A field experiment was conducted at Instructional Farm (Agronomy), RCA, Udaipur, (Rajasthan) during Kharif, 2014 on clay loam soil to study the effect of integrated nutrient management on symbiotic efficiency and fertility status of post-harvest soil under Green gram cultivation. The experiment was laid out according to a factorial randomized block design with three replications. The experiment comprised four fertility levels (75% RDF, 75% RDF+VC @ 2 t ha-1, 100% RDF and 100% RDF+VC @ 2 t ha-1) and four biofertilizers levels (control, Rhizobium, PSB and Rhizobium + PSB). The RDF was 20 kg N and 40 kg P2O5 per hectare. The soil of the experimental site was clay loam in texture, slightly alkaline in reaction, medium in available nitrogen and phosphorus, while high in potassium and DTPA extractable micronutrients sufficiently above the critical limits. The application of fertility level significantly increased the number of total and effective root nodules, fresh and dry weight of root nodules and leg haemoglobin content in root nodules upto 75% RDF+VC @ 2 t ha-1 however, their further increase with application of 100% RDF+VC @ 2 t ha-1 was found non-significant. Seed inoculation with Rhizobium + PSB significantly increased the number of total and effective root nodules, fresh and dry weight of root nodules and leg haemoglobin content in root nodules. The organic carbon, available nitrogen, phosphorus, potassium, copper, zinc, iron and manganese in soil significantly increased with inoculation of Rhizobium + PSB at the harvest stage of the crop, but EC and pH remain non-significant.