EFFECTS OF PHOSPHORUS AND SULPHUR INTERACTION ON NUTRIENT UPTAKE AND YIELD OF BLACK GRAM (VIGNA MUNGO L. HEPPER)
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Date
2016
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Division of Soil Sc. & Agr. Chemistry, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
The study entitled “Effects of phosphorus and sulphur interaction on nutrient uptake and yield of black gram (Vigna mungo L. Hepper)” was conducted at Research Farm of Division of Soil Science and Agricultural Chemistry, SKUAST-J, Main Campus, Chatha during summer season of 2015 with four levels of Phosphorus (P) i.e. 0, 20, 40 and 60 kg P ha-1 and three levels of Sulphur (S) i.e. 0, 15 and 30 kg S ha-1 with three replications to investigate the interaction effect of P and S application on nutrient uptake and yield of black gram (cv. Uttara) using Factorial Randomized Block Design (F-RBD). The experimental soil was sandy clay loam, pH : 8.25, organic carbon 3.80 g kg-1, available phosphorus and sulphur values were 21.22 and 9.29 kg ha-1, respectively.
The results revealed that combined application of P and S showed synergistic effect on seed and stover yield of black gram with increasing levels of P and S upto highest level. The seed and stover yield were 955.50 and 2398.30 kg ha-1 with combined application of 60 and 30 kg ha-1, P and S respectively, indicating synergistic effect of P and S on each other as both the nutrients mutually help absorption and utilization by black gram probably due to balanced nutrition. The various growth parameters and yield attributes of black gram viz. plant height, number of pods plant-1, 100-seed weight, number of nodules plant-1 also increased significantly with increasing levels of P and S up to highest level and the optimum values were recorded with combined application of 60 kg P ha-1 and 30 kg S ha-1. However non significant response of P and S application has been observed in case of plant population (m-2), while it slightly increased with each successive application of P and S up to 60 kg P ha-1 and 30 kg S ha-1.
The optimum phosphorus concentration (per cent) and uptake (kg ha-1) in seed (0.376, 3.59) and stover (0.266, 6.38) of black gram was also recorded with combined application of 60 kg P ha-1 and 30 kg S ha-1 indicating synergistic effect of P and S on each other. Similarly, the optimum sulphur concentration (per cent) and uptake (kg ha-1) in seed (0.397, 3.79) and stover (0.134, 3.21) was recorded with combined application of 60 kg P ha-1 and 30 kg S ha-1.
The available and organic phosphorus (kg ha-1) in soil significantly increased with each successive application of P up to the highest level of 60 kg P ha–1 over control at 20 days after sowing (DAS) of black gram, while it showed decreasing trend with time intervals of 40 DAS and at maturity of black gram. The application of successive doses of S had non significant effect on available and organic phosphorus at each time interval. Similarly, significant increase has been recorded in available and organic sulphur (kg ha-1) in soil with each successive application of S up to 30 kg S ha–1 over control at 20 DAS of black gram, however it showed decreasing trend with time intervals of 40 DAS and at maturity of black gram. The application of successive doses of P had non significant effect on available and organic sulphur content at each time interval.