Study of Nano Urea application under graded n rates on growth, productivity and nitrogen use efficiency of transplanted rice (Oryza sativa L.)
Pantnagar Journal of Research, Volume - 22, Issue - 2 ( May-August 2024)Published: 2024-08-31
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Abstract
A field experiment was convened at A-2 block (Rice Agronomy block) Norman E. Borlaug Crop Research Centre of G. B. Pant University of Agriculture and Technology, Pantnagar on a sandy loam soil (Mollisol) during Kharif 2022 for the experiment of “study the impact of Nano Urea application under graded N rates on growth, productivity and nitrogen use efficiency of transplanted riceâ€. The soil was neutral in pH (7.5), medium in Organic Carbon content (0.64%), Low in Nitrogen (177.6 Kg/ha), moderate in Phosphorus (19.6 Kg/ha), and medium in Potassium (198.3 Kg/ha). The study was conducted using Randomized block design in 9 treatments and each has 3 replications and the Rice variety Dhan-24(PD-24) was used. The treatments embodied of T1 (100% RDN), T2 (75% RDN), T3 (50% RDN + 2 Foliar Spray of Nano Urea (AT, PI)), T4 (75% RDN + 2 Foliar Spray of Nano Urea (AT, PI)), T5 (100% RDN + 2 Foliar Spray of Nano Urea (AT, PI)), T6 (50% RDN + 2 Foliar Spray of Urea (AT, PI)), T7 (75% RDN + 2 Foliar Spray of Urea (AT, PI)), T8 (100% RDN (1/3 + 1/3 + 1/3 ) + 2 Foliar Spray of Nano Urea (AT, PI)) and T9 (Control).The growth parameters were considerably influenced by different treatment at 30, 60, and 90 days after Transplanting (DAT) and upon reaching the maturity. At initial stages of crop growth, T1 has reported significantly higher plant height, tiller m-2, dry matter accumulation and SPAD value. But as the crop grew farther, the treatment T8 had much higher growth parameters that were comparable to those of T5. The yield attributing characters (number of panicles m-2, number of filled spikelet per panicle, number of unfilled spikelet per panicle, spikelet sterility, and grain weight per panicle) were significantly affected by various treatments. However, panicle length, number of spikelet per panicle and 1000 grain weight were found to be non- significant. The treatment T8 reported significantly higher yield attributes which were at par with T5. The treatment T8 also reported the highest grain, straw, and biological yields which were 11.9%, 8.5%, and 9.9% higher than T1 respectively. However, harvest index was not significantly affected by various treatments. The economics of rice production was also significantly affected by various treatments reporting the highest gross returns, net returns and B/C ratio in T8.
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