Influence of Establishment Methods and Site-Specific Nitrogen Approaches on Growth Functions and Yield of Rice
Year: 2018
Type: article
Abstract: A Field experiment was taken up during kharif season of 2014 and 2015 on sandy loam soils at College of Agriculture, Navile, Shivamogga, Karnataka, India. Leaf area was significantly higher in the system of rice intensification (SRI) method of establishment from 30 DAT and reached a peak value at 90 DAT then decreased. At 90 DAT, leaf area was 1717.21 cm2 as compared to aerobic (967.97 cm2) and conventional (1002.31cm2) methods of establishment. The leaf area coverage in proportion to ground and also the functional ability of leaves remained more in SRI method resulting significantly higher total dry matter accumulation (116.03 g plant-1) compared to conventional (95.73 g plant-1) and aerobic (65.41 g plant-1) methods at harvest. As a result, it recorded significantly higher absolute (0.63, 0.84 and 1.60 g plant-1 day-1 at 30 to 60, 60 to 90 and 90 DAT to harvest), relative (0.028 gg-1 day-1 up to 90 DAT) and crop growth rates. Thereby established higher grain (7767 kg ha-1) and straw (8878 kg ha-1) yield over other methods of establishments. Soil test and crop response (STCR) approach of nitrogen application recorded significantly higher leaf area (1313.24 cm2), leaf area index (3.20) and leaf area duration (111.87 days) at 90 days after sowing or transplanting closely followed by leaf colour chart (LCC) compared to other nitrogen management approaches. As a result, STCR approach recorded higher dry matter accumulation at all the growth stages (4.08 g plant 1 at 30 DAT, 29.73 g plant 1 at 60 DAT, 57.82 g plant 1 at 90 DAT and harvest it was 101.60 g plant 1) along with absolute and relative growth rates resulting in significantly higher grain (7183 kg ha-1) and straw yield (8314 kg ha-1) closely followed by LCC approach over other nitrogen management approaches. Method of establishment by SRI with STCR approach of nitrogen management yielded better leaf area and its components to achieve higher yields (8348 kg ha-1) and becomes best.
Authors: M.R. Bhavya, M. Dinesh Kumar
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W2804737732