Effect of Nano nitrogen and Nano zinc application on nutrient content and their uptake by transplanted rice crop (Oryza sativa L.)

Abstract

To evaluate the effect of nano nitrogen and nano zinc application on nutrient content and their uptake by transplanted rice (Oryza sativa L.) crop, a field experiment was carried out during the kharif season of 2023 at the Research Farm of the School of Agriculture, Abhilashi University, Mandi (H.P.). The experiment was laid out in randomized block design (RBD) with seven treatments and replicated thrice. The different treatment combination was T1= Absolute control, T2= 100% RDN by urea, T3= T2 + soil application of zinc, T4= [T2 + Nano nitrogen (4 ml L-1)], T5= [T2 + Nano zinc (2 ml L-1)] T6= [80% RDN + Nano nitrogen (4 ml L-1)], T7= [80% RDN + Nano zinc (2 ml L-1)]. The analysis of data revealed that there are no significant differences in nitrogen, phosphorus, potassium and zinc content in grains and straw of transplanted rice crop with the application of nitrogen and zinc. Interestingly, despite no significant changes in nutrient content, there was a noticeable significant differences were found in nutrient uptake under different treatment conditions. The application of treatment T3= (T2 +soil application of zinc) recorded significantly highest uptake of nitrogen, phosphorus, potassium and zinc by grains and straw of transplanted rice crop. Similarly, the total uptake of nitrogen, phosphorus, potassium and zinc was also found to be higher under treatment T3. The treatments T1 (Absolute control) were found to have minimum nitrogen, phosphorus, potassium and zinc content and uptake by grains and straw of transplanted rice crop. Strategic nutrient management, particularly zinc supplementation combined with 100% recommended dose of nitrogen and spraying of nano nitrogen significantly enhances nutrient uptake in transplanted rice crop, despite no significant changes in nutrient content. This underscores the importance of zinc and nitrogen application for improving nutrients uptake by transplanted rice crop.