Vol. 9, Special Issue 12, Part G (2025)

A field experiment was carried out during the rabi season of 2017-18 at the Instructional Farm of the Orissa University of Agriculture and Technology, Bhubaneswar, to evaluate the impact of different nutrient management practices on green gram grown under rice fallow conditions. Twelve treatments were tested in a randomized block design with three replications. These included: T₁—recommended dose of fertilizer (RDF) at 20:40:20 N:P₂O₅:K₂O; T₂—2% urea spray at 26 and 36 DAS; T₃—2% DAP spray at 26 and 36 DAS; T₄—2% NPK (19:19:19) spray at 26 and 36 DAS; T₅—T₁ + 2% urea spray at 26 DAS; T₆—T₁ + 2% DAP spray at 26 DAS; T₇—T₁ + 2% NPK (19:19:19) spray at 26 DAS; T₈—T₁ + T₂; T₉—T₁ + T₃; T₁₀—T₁ + T₄; T₁₁—T₁ + water spray at 26 and 36 DAS; and T₁₂—absolute control. The soil at the site was sandy loam, slightly acidic (pH 5.23), low in available nitrogen, medium in phosphorus, and high in potassium. The green gram variety IPM 02-14 was grown using recommended agronomic practices.

Results showed that the highest number of root nodules occurred with the application of RDF as basal fertilizer along with a 2% NPK (19:19:19) spray at 26 and 36 DAS. The greatest nutrient uptake (57.94 kg N ha⁻¹, 5.51 kg P ha⁻¹, and 36.50 kg K ha⁻¹) was also observed under this treatment. Residual soil nutrient status improved slightly, with available nitrogen and potassium increasing to 195.8 and 303.8 kg ha⁻¹, respectively, under the same treatment. The highest available phosphorus (29.3 kg ha⁻¹) was recorded in the treatment receiving RDF as basal plus two sprays of 2% DAP, compared to initial soil levels of 182.1 kg N ha⁻¹, 16.2 kg P₂O₅ ha⁻¹, and 298.4 kg K₂O ha⁻¹.