PJB-2019-633
FERTILIZATION REGIMES AND WEED FREE DURATIONS INFLUENCED NUTRIENT UPTAKE AND PADDY YIELD OF DIRECT SEEDED FINE RICE
Prof. Dr. Muzammil H. Siddiqui
Abstract
Under changing climate, fertilization methods and weeds infestation in aromatic direct seeded fine rice (DSR) remain vital for ensuring food security. A multi-year field study was undertaken to appraise the influence of method of fertilization and weed free periods on weed dynamics, nutrients uptake and paddy yield. Treatments included two fertilization methods (broadcasting and side placement) and five weed free periods (20, 30, 40, 50 days after sowing) along with a season-long weed free crop. Weed competition for season-long crop (weedy check) was maintained for each fertilizer application method. Side placement of fertilizer resulted in less weed density and biomass even under season-long weed competition. The highest paddy yield was recorded under season-long weed-free crop, followed by weed-free duration up to 50 DAS. The uptake of N nitrogen (N), phosphorus (P) and potassium (K) by weeds in plots kept weed free up to 50 DAS was only 19, 9 and 8%, respectively as compared to weedy check. The uptake of N, P and K by weeds in the broadcast method was 18, 30 and 24% higher compared to side placed fertilizers. The period of 20-50 DAS remained critical in DSR as far as weed control was concerned. Thus, side placement of fertilizers and controlling weeds up to 50 days after rice sowing can recommended for general adaptation.
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