Jakhar, Devender SinghKOCHAR, DEEPAK2022-08-202022-08-202019-06https://krishikosh.egranth.ac.in/handle/1/5810186490The field experiment was conducted on Research Farm of Krishi Vigyan Kendra, Sirsa during kharif season of 2018-19, to study effect of different nutrient management practices on cotton productivity and fertility status of soil. The experiment was laid out in a randomized block design (RBD) with following treatments i.e. T1- Control, T2- RDF on soil test basis (N in three split doses at basal, 45 and 75 DAS), T3- RDN + Azotobacter, T4- 75 %RDN + Azotobacter, T5- 75 %RDN + Azotobacter + 3 foliar spray of 2.5 % Urea, T6- 75 %RDN + 3 foliar spray of 2.5 % Urea, T7- 100 % RDN in four split doses @sowing, 45, 75, 100 DAS and T8- 75 % RDN in four split doses @sowing, 45, 75, 100 DAS + 3 foliar spray of 2.5 % Urea. The treatment were replicated thrice in a net plot area of 6 m x 5 m. Recommended dose of fertilizers and other package of practices were uniformly adopted in all the treatments for growing healthy crop. All foliar sprays were applied from flowering to peak boll formation stage at 10 days interval. The result revealed that the plant population was not significantly affected with different nutrient management treatments. Application of 75 % RDN + 3 foliar spray of 2.5 % urea (T6) recorded highest seed cotton yield (2948.89 kg ha-1), boll weight (4.06 g), seed cotton yield per plant (200.33 g) and number of bolls per plant (49.67). The highest dry matter (87.34,279.40,334.54 and 328.19 g) was in T3 at square formation and flowering stage while at 50 % boll opening it was highest in T2 and at harvesting in T6. Highest uptake on NPK at harvesting was observed in T6. The organic carbon differ non significantly with in treatment and showed a decreasing from square formation to harvesting. The available NPK increase from its initial value and then decreased continuously as the crop reached towards maturity. The available NPK was highest in T3 (234.70, 230.00, 152.40 and 135.50 kg ha-1), T4 (23.0, 25.1, 23.1 and 21.7 kg ha-1) and T3 (277.23, 280.47, 257.77 and 246.57 kg ha-1) at square formation, flowering, 50 % boll opening and at harvesting stage respectively and lowest available NPK was in control. The MBC of soil decrease from its initial value up to flowering and then increase and reached near to its initial value at harvesting and recorded highest in T7. Highest net income of (Rs.68,214/ ha) and B: CEnglishThesis