Vol. 12, Special Issue 9 (2023)

Author(s):
Stesi S, Dr. M Raju, Dr. S Pazhanivelan, Dr. KP Ragunath and Dr. S Selvakumar

Abstract:
Field experiments were carried out at Eastern Block Farm, Centre for Water and Geospatial Studies, Tamil Nadu Agricultural University, Coimbatore during the winter and summer seasons (2022-2023) to evolve the optimum fertigation scheduling in high density cotton through Crop Growth Curve Nutrition Approach (CGCNA). The experiments were laid out in RBD and replicated thrice. The treatments comprises of different NPK fertilizers levels that are being supplied through fertigation in a definite ratio at different growth stages viz., seedling stage (10% NPK), vegetative stage (20% NPK), square formation (30% NPK), 50% flowering (20% NPK), boll formation and boll development stages ((10% NPK) and its comparative study with drip and conventional irrigation practice with STCR based recommendations of fertilizer NPK and 100% RDF NPK as soil application in the same split ratios (i.e., seedling stage (10% NPK), vegetative stage (20% NPK), square formation (30% NPK), 50% flowering (20% NPK), boll formation and boll development stages (10% NPK) to cotton planted under HDPS. The growth yield and yield attributes were significantly influenced by various levels of fertigation schedules and their combination. The maximum yield of 3568 and 3475 kgha^-1 were recorded under 25% enhanced dose of K along with 100% of N&P through fertigation during winter and summer seasons respectively.