RESPONSE OF FODDER SORGHUM (SORGHUM BICOLOR) TO INTEGRATED NUTRIENT MANAGEMENT FOR SUSTAINABLE AGRICULTURAL PRODUCTION.

Dwivedi AK, Sharma G,Tomar PS and Sutaliya R

A field experiment on fodder sorghum was carried out at the Central Research Farm, College of Agriculture, Gwalior (MP) during Kharif 2000 to evaluate the contribution of organic manure and biofertilizer in relation to inorganic fertilizer on sustainable basis. The soil of the experimental site was sandy loam in texture with 7.5 pH, low in N and medium in both P and K. The trial consisting of sixteen treatments, viz., 50%, 75%, 100%, 150%RFD (80: 40: 20: 20 kg NPKS ha-1), 100%NPS, 100%N, 100%NPK-S, 50%NPKS+Azo., 75%NPKS+Azo., 100%NPKS+Azo, 50%NPKS+Azo.+PSB, 100%NPKS+ FYM+PSB, 75%NPKS+FYM, 100%NPKS+FYM, 100% NPKS+ FYM+ Azo.+ PSB and Control, was laid out in randomized bock design with three replications. The fodder yield increased with increasing fertility levels from 50 to 150% RFD (Recommended dose of NPKS) either inorganic or in combination with FYM and/or biofertilizers. 100%NPKS+FYM+ Azo.+ PSB followed by 100%NPKS+FYM registered significantly higher fodder yield (222q ha-1), N,P, K and S contents and their residue in soil over rest of the treatments. Incorporation of FYM @10 qha-1 signified the substitutive role of organic source by producing statistically equal fodder yield in 50%NPKS+FYM as compare to 100%NPKS+FYM. Seed inoculation with Azotobactor and combined use of Azotobactor and PSB proved better with respect to fodder yield and N,P,K and S content over their corresponding nutrient treatments. A significant decrease in the fodder yield, nutrient content and their residual status was noted in treatments viz., 100%N, 100%NP, and 100%NPK-S by deleting P, K and S, respectively.

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