EFFICACY OF NEEM COATED UREA THROUGH NITROGEN USEEFFICIENCY METHODS IN BT COTTON UNDER RAINFEDVERTISOLSD. LAKSHMI KALYANI, K. SANKAR NARAYANAN, A. SITHA RAMA SHARMA,M. SIVA RAMA KRISHNA, K. VENKATA RAMANAMMA AND K. ARUN KUMAR
A scientific field experiment was conducted during 2017, 2018 and 2019 in kharif season atR.A.R.S,Nandyal, Acharya N.G. Ranga Agricultural University to study Efficacy of Neem coated ureathrough nitrogen use efficiency methods in Bt cotton. The experiment consisting of seven nitrogenuse efficiency treatments with combination of three nitrogen doses viz: No nitrogen, 75%recommended dose of nitrogen, 100% recommended dose of nitrogen, 2 methods of nitrogenapplication viz: band application and split application and 4 stages of nitrogen top dressing viz:basal, squaring, flowering and boll development stages along with foliar application of 1% ureaat squaring, flowering, boll development stage with RBD design and replicated thrice. The resultsindicated that pooled seed cotton yield (2813 kg/ha), nutrient uptake and cotton economics werehigher with spot application 75% recommended dose of nitrogen with 4 split doses of nitrogenalong with foliar application of 1% urea at squaring, flowering and boll developmental stage andwas on par with spot application of 75% recommended dose of nitrogen with 4 split doses ofnitrogen, foliar application of 1% urea at squaring, flowering and boll developmental stage alongwith incorporation of fodder cowpea before flowering (2681 kg/ ha). Lower seed cotton yield (1637kg/ ha) was recorded with no nitrogen treatment.