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Effect of Real Time N Management on Biomass Production, Nutrient Uptake and Soil Nutrient Status of Direct Seeded Rice (Oryza sativa L.)

Author(s): Gunasekhar Nachimuthu | V. Velu | P. Malarvizhi | S. Ramasamy | K.M. Sellamuthu

Journal: American Journal of Plant Physiology
ISSN 1557-4539

Volume: 2;
Issue: 3;
Start page: 214;
Date: 2007;
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Keywords: Rice | LCC | biomass | nutrient uptake | soil nutrient status

A field experiment was conducted at Tamil Nadu Agricultural University, Coimbatore, in deep clay soil (Vertic ustochrept) to study the effect of real time N management using Leaf Color Chart (LCC) on biomass production, nutrient uptake and soil available nutrient status in short duration rice (Var. CO 47) under direct wet (drum) seeded condition. The study was conducted in factorial randomized block design with three replications. The treatments included maintaining three LCC critical values (cv.) viz., LCC 3, 4 and 5 with different rates of N application (20, 25, 30 and 35 kg N ha-1 each time, besides absolute control (Zero-N), Blanket N (120 kg N ha-1in four equal splits from 21 Days After Sowing (DAS) and Manage N practices (120 kg N ha-1 in four unequal splits). The results of the experiment suggest that rate of biomass production and NPK uptake were highest during panicle initiation to first flowering stages for the tested variety CO 47 and LCC based N management have effectively saved the N fertilizer. The lack of difference in soil available nutrient between LCC based treatments and conventional blanket N treatment suggest that LCC based N management could be best option for farmers to save fertilizer N besides maintaining soil fertility. The results suggest further scope to standardise the LCC based N management for different intensively cultivated cultivars at specific location and season.
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