Evaluation of Nano Urea Treatments on Growth and Yield of Single Cut Fodder Oat (Avena sativa L.) under Rabi Season

A field experiment was conducted to assess the impact of nano urea on growth and yield of single cut fodder oat (Avena sativa L.)” at ICR farm, Assam Agricultural University, Jorhat, (rabi season of 2023-24). The soil of the experimental site was sandy loam in texture, acidic in reaction (pH 5.67), medium in organic carbon (0.64%) and available K2O (167.65 kg ha-1), while low in available N (256.6 kg ha-1) and available P2O5 (21.45 kg ha-1). Ten different treatments were included to compare nano urea with conventional urea across doses and methods, identify optimal nitrogen management, capture variability, ensure statistical reliability, and assess fodder yield. Experimental findings revealed that application of 75% recommended dose of N + nano urea spray @4 ml/l (30 and 50 DAS) (T5) resulted in significantly higher growth parameters viz., plant height, plant population per meter, leaf: stem ratio, tillers per plant, leaf area index, and crop growth rate. The highest green fodder yield (32.55 t ha-1) and dry fodder yield (7.99 t ha-1) were recorded with the application of 75% recommended dose of N + nano urea spray @4 ml/l (30 and 50 DAS) (T5).