Effect of nutrient management approaches on seed yield and nutrient uptake of soybean-sorghum based cropping system

Abstract

The improvement in seed yield characters was the manifestation of improved growth characters as a result of higher uptake of nutrients caused by balanced supply of nutrients in this regard soil test based nutrient management approaches aims provide a scientific basis for balanced fertilization to obtain more yield per unit of fertilizer investment. An experiment was conducted during kharif and rabi seasons of 2017-18 and 2018-19 at Agricultural Research Station, Janwada, Bidar district, which comes under the jurisdiction of University of Agricultural Sciences, Raichur, to study the soil test based nutrient management approaches on seed yield and nutrient uptake of soybean-sorghum cropping sequence. Pooled results indicate that maximum seed yield (27.82q ha -1 ) was recorded with application of nutrients as per SSNM approach for targeted yield of 30q ha -1 +25kg FeSO4 5H2O ha -1 in soybean. Similarly maximum sorghum grain yield (1210kg ha -1 ) was recorded with the residual effect of nutrients through SSNM approach for targeted yield of 30q ha -1 +25kg FeSO4 5H2O ha -1 and higher uptake of nutrients (seed +haulm) viz., nitrogen (231.99kg ha -1 ), phosphorus (17.17kg ha -1 ), potassium (90.04kg ha -1 ) sulphur (55.82kg ha -1 ), zinc (159.36g ha -1 ), iron (3035.2g ha -1 ), and), boron (75.88g ha -1 ) by soybean. Similarly higher uptake of nutrients (grain +stover) viz., nitrogen (22.83kg ha -1 ), phosphorus (9.64kg ha -1 ), potassium (29.43kg ha -1 ), sulphur (2.68kg ha -1 ), zinc (49.70g ha -1 ),), iron (121.04g ha -1 ), and), boron (20.98g ha -1 ) by sorghum was recorded with residual effect of nutrients through SSNM approach targeted yield of 30q ha -1 +25kg FeSO4 5H2O ha -1 as compared to absolute control, RDF, and other soil test methods.