Studies on the Effect of Irrigation and Integrated Nutrient Management Levels on Growth and Yield Of Bt-Cotton in Vertisol
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Date
2015-12
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University of Agricultural Science, Dharwad
Abstract
A field experiment was conducted at Water Management Research Centre (WMRC) Belvatagi, Navalgund taluk (Dharwad dist.) during kharif 2014-15 to study the effect of irrigation levels and integrated nutrient management levels on growth and yield of Bt-cotton in Vertisol. Irrigation scheduled at 0.8 IW/CPE (I1) recorded significantly higher kapas yield (17.32 q ha-1) as compared to irrigation scheduled at critical stages (15.21 q ha-1). Among the INM levels, F3 recorded significantly higher kapas yield (18.11 q ha-1). Among interactions, I1F3 recorded significantly highest kapas yield (19.08 q ha-1) as compared to other interactions. Integrated use of fertilizers and organics increased pH and macronutrients in soil. F5 treatment recorded significantly higher organic carbon (7.4 g kg-1) than the treatment F1 (RPP) and F2 (RPP + one row of sunhemp between two rows of Bt-cotton). Higher available nitrogen (204.52 kg ha-1), phosphorus (38.62 kg ha-1) and potassium (778.48 kg ha-1) were recorded in F3 treatment. Higher available iron (4.31 mg kg-1) and boron (0.36 mg kg-1) contents were recorded in F3 treatment. Higher available zinc (0.65 mg kg-1) was recorded in the treatment 50% RDF + FYM @ 10 t ha-1 + one row of sunhemp between two rows of Bt-cotton + ZnSO4.7H2O @ 25 kg ha-1 + FeSO4.5H2O @ 25 kg ha-1 + Borax @ 5 kg ha-1 (F5). Application of chemical fertilizers without organics reduced available micronutrients in the soil. It can be concluded that treatment combination of RPP + one row of sunhemp between two rows of Bt-cotton + ZnSO4.7H2O @ 25 kg ha-1 + FeSO4.5H2O @ 25 kg ha-1 + Borax @ 5 kg ha-1 and irrigation at 0.6 IW/CPE (I2F3) found suitable for getting higher yield and net profit which also saves water.
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