RICE RATOONING - IRRI books - International Rice Research Institute

RATOONING IN BANGLADESH 147Table 4. Grain yields of main crop and ratoon crop grown during boro and ausseasons.Cropping pattern Grain yield (t/ha) GrowthdurationBoro AUS Boro Aus Ratoon Total (d)BR3BR3BR3PajamPajamPajamBaspatlBaspatlBaspatl– BR3 6.7– Ratoon 6.1– Ratoon + BR3 relayed 6.3– Pajam 6.3– Ratoon 5.9– Ratoon + Pajam relayed 5.7– Baspati 4.3– Ratoon 4.9– Ratoon + Bsspati 4.23.7–1.83.4–1.72.6–0.8–0.00.0–2.41.8–1.61.210.46.18.19.78.39.26.96.56.224513025327022 12602572022442. Rice-based cropping patterns based on monthly average maximum rainfall inupland areas.Ratooning of BRI and IR50 grown as main aus crops, followed by relaytransplantedBR11 and IR50 varieties during aman under rainfed conditions, wasstudied. The aus main crop was harvested in August, leaving 15 cm stubble. Early inSeptember, aman seedlings were transplanted between the ratoon hills, as a relaycrop (Table 5). The highest ratoon yield (1.1 t/ha) was obtained with IR50. Thesingle t. aman yield (without relay with ratoon) was higher than the ratoon crop with