INTERACTION EFFECTS OF NITROGEN AND SULPHUR ON NUTRIENT UPTAKE, YIELD AND QUALITY OF SOYBEAN (Glycine max L.)
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Date
2018
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PROFESSOR JAYASHANKAR TELANGANA STATE DAGRICULTURAL UNIVERSITY
Abstract
A field experiment was conducted on “INTERACTION EFFECTS OF NITROGEN AND SULPHUR ON NUTRIENT UPTAKE, YIELD AND
QUALITY OF SOYBEAN (Glycine max L.)” during kharif, 2017 at College
Farm, Agricultural College, Polasa, Jagtial, Professor Jayashankar Telangnana State Agricultural University. The experiment was laid out in randomized block design with factorial concept (FRBD) with three replications. Four levels of nitrogen viz., 0, 40, 80, 120 kg N ha-1 and four levels of sulphur viz., 0, 20, 30 and 40 kg ha-1 were adopted, thus a total of 16 treatments were imposed. Soybean variety JS-335 was used for the study. The soil of the experimental site was sandy loam in texture, neutral in reaction (pH 7.26) with an EC of 0.10 d Sm-1, low in organic carbon content (0.34 %), low in available N (228 kg ha-1), medium in available P (15.8 kg ha-1), high in available K (336 kg ha-1) and deficient in available sulphur (9.6 mg kg-1).
Both haulm and seed yield of soybean increased significantly due to individual application of nitrogen and sulphur. Highest seed and haulm yield of 1997 and 3069 kg ha-1 was recorded with the application of 120 kg N ha-1. Application of 40 kg S ha-1 resulted in highest seed and haulm yield of 1874 and 2858 kg ha-1. Combined application of 120 kg N and 40 kg S ha-1 produced highest seed yield of 2160 kg ha-1. Application of increasing levels of both nitrogen and sulphur resulted in a progressive increase in nutrient (N, P, K, and S) content of soybean in haulm and seed. Application of 120 kg N ha-1, recorded maximum nutrient content of N, P, K and S of 6.73, 0.7, 0.89 and 0.39 per cent, respectively in seed. While in haulm N, P, K, and S content was 1.73, 0.30, 0.99 and 0.17 per cent, respectively. Among the sulphur levels application of 40 kg S ha-1 recorded maximum N, P, K, and S content
in seed as 6.31, 0.70, 0.86 and 0.38 per cent, respectively. While N, P, K, and S content in haulm was 1.53, 0.30, 0.90, 0.17 per cent, respectively. Combined application of nitrogen and sulphur further enhanced the nitrogen and sulphur concentration in both seed and haulm of soybean. A significant increase in nutrient uptake viz., N, P, K, and S was observed with increasing levels of N and S both in seed and haulm of soybean.
Application of increasing levels of nitrogen and sulphur significantly influenced the oil and protein content. Highest content of oil (18.65 per cent) and protein (40.34 per cent) was observed with the application of 120 kg N ha-1. Application of 40 kg S ha-1 recorded the highest oil (18.38 per cent) and protein content (38.74 per cent). Application of increasing levels of nitrogen and sulphur resulted in gradual increase in oil yield and a maximum oil yield of 372.47 and
kg ha-1, were recorded with the application of 120 kg N ha-1 and 40 kg S ha-1, respectively. Application of nitrogen and sulphur improved available nutrient status
(N, P, K and S) of soil after harvest of soybean.
The application of nitrogen and sulphur tended to increase the nitrogen fractions (ammonical and nitrate nitrogen) and sulphur fractions (water soluble, KH2PO4 extractable and heat soluble sulphur) of soil at flowering and harvest of soybean. Among the nitrogen fractions nitrate nitrogen concentration is higher compared to ammonical nitrogen during both the stages of crop growth. Nitrogen and sulphur also exerted a significant positive effect on different sulphur fractions in the soil. The order of inorganic sulphur fraction was heat soluble > KH2PO4 extractable > water soluble sulphur. The positive response was observed by increasing nitrogen and sulphur levels on gross returns, net returns and B:C ratio in soybean. Combined application of 80 kg N and 40 kg S ha-1 showed higher B:C ratio (2.09) and highest net returns (Rs. 50290/- ha-1) in soybean.
From the results obtained from this study it could further be concluded that the combined application of 80 kg N and 40 kg S ha-1 would be an ideal practice to achieve higher yields and income, thus indicating this particular treatment is the best for recommendation to the farmer for soybean.
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D10,246