NITRATE ACCUMULATION IN SORGHUM (SORGHUM BICOLOR) AS INFLUENCED BY SULPHUR AND PHOSPHORUS APPLICATION UNDER INCREASING NITROGEN LEVELS
|SUCHHANDA MONDAL1* and B. K. NAD2
|Corresponding Author: SUCHHANDA MONDAL,Assistant Professor, Institute of Agriculture, Visva-Bharati, Sriniketan-731236, West Bengal, India, E-mail: [email protected]|
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A green house experiment was conducted to study the effect of phosphorus and sulphur under increasing levels of nitrogen on NO3-N accumulation by sorghum. Three levels of nitrogen (60, 120 and 240 kg N ha-1), two levels of phosphorus (0 and 90 kg P2O5 ha-1) and two levels of sulphur (0 and 45 Kg ha-1) comprised the treatment combinations. At 35 and 70 DAS, plants were harvested and analyzed for NO3-N, total N, P, K, S, Ca and Mg contents. Total nitrogen uptake increased with increasing nitrogen application and application of sulphur and phosphorus. NO3-N content was also increased with increasing rate of nitrogen application but decreased with application of sulphur and phosphorus, and with age. Phosphorus and sulphur application increased P, S, K, Ca and Mg uptake. Nitrogen application at increasing rate increased the per cent sulphur derived from fertilizer and per cent fertilizer sulphur utilization, however phosphorus caused a reduction in both the values.