Studies on Nitrogen Requirement of New Genotypes of Non-scented and Scented Rice
Charan Singh *
CCSHAU, Rice Research Station, Kaul, Kaithal, Haryana 136021, India and Department of Soil Science, CCSHAU, Hisar, Haryana 125004, India.
Amit Kumar
CCSHAU, Rice Research Station, Kaul, Kaithal, Haryana 136021, India.
Sukham Madaan
CCSHAU, Rice Research Station, Kaul, Kaithal, Haryana 136021, India.
Lalita
CCSHAU, Rice Research Station, Kaul, Kaithal, Haryana 136021, India.
Sumit Saini
CCSHAU, Rice Research Station, Kaul, Kaithal, Haryana 136021, India.
Rakesh Kumar
CCSHAU, Rice Research Station, Kaul, Kaithal, Haryana 136021, India.
Ashish Jain
CCSHAU, Rice Research Station, Kaul, Kaithal, Haryana 136021, India.
Vishal Gandhi
CCSHAU, Rice Research Station, Kaul, Kaithal, Haryana 136021, India.
Parvesh Kumar
CCSHAU, Rice Research Station, Kaul, Kaithal, Haryana 136021, India.
Gayatri Kumari
Department of Botany and Plant Physiology, CCSHAU, Hisar, Haryana 125004, India.
Ankit
Department of Soil Science, CCSHAU, Hisar, Haryana 125004, India.
*Author to whom correspondence should be addressed.
Abstract
A field experiment was conducted at the CCSHAU Rice Research Station, Kaul, during Kharif 2024 to evaluate the effects of nitrogen levels on productivity, nutrient uptake, and post-harvest soil fertility in scented and non-scented rice genotypes. Three nitrogen levels (75%, 100%, and 125% of the recommended dose of nitrogen [RDN]) and nine rice genotypes were evaluated. Nitrogen application had no significant effect on post-harvest soil pH, electrical conductivity or organic carbon; however, available soil nitrogen, phosphorus and potassium increased significantly, with the highest values under 125% RDN. Among the genotypes, Basmati CSR 30 maintained the highest post-harvest available nitrogen (173.27 kg ha⁻¹) and phosphorus (28.97 kg ha⁻¹), whereas HKR 48 recorded the highest available potassium (351.47 kg ha⁻¹). Application of 125% RDN produced the highest number of panicles (314.07 m⁻²), grains per panicle (126.93), test weight (24.73 g), grain yield (5734 kg ha⁻¹), and straw yield (7432 kg ha⁻¹). However, grains per panicle, test weight, and grain yield were statistically at par with those under 100% RDN. Grain nutrient concentrations also increased with nitrogen application. INGER 75 produced the highest grain yield (6159 kg ha⁻¹), whereas HKR 18-33 produced the highest straw yield (8883 kg ha⁻¹). Although 125% RDN maximized yield, nutrient concentration and residual soil fertility, 100% RDN achieved a comparable grain yield, indicating that the recommended nitrogen dose was adequate for efficient rice production under the study conditions.
Keywords: Nitrogen management, recommended dose of nitrogen, rice genotypes, non-scented rice, scented rice, grain yield, straw yield, nutrient uptake, post-harvest soil fertility, nitrogen-use efficiency