RICE RATOONING - IRRI books - International Rice Research Institute

64 RICE RATOONING3. Rice ratooning crop sequence in Jicomé and Castañuelas. Dominican Republic 1985 (7).Table 1. Fertilizer applied (kg/ha) to thesites in the Dominican Republic, 1985. a ratoon and second planted crop in twoFertilizer Jicomé CastañuelasNPKNPK88132107430Ratoon cropSecond planted crop9470.81573.43a Based on a survey of 400 ha of ratoon crop in each site, and 15 ha in Jicomé and20 ha in Castañuelas of second planted crop. b Formulas used included 15-15-15,16-20-0, and 12-24-12. Urea and ammonium sulfate were also used.bugs, Oebalus sp. Eight of 14 farmers in Jicomé did a third fertilizer application atthis stage. Total fertilizer applications in the ratoon crop and second planted crop in1985 in Jicomé and Castañuelas are shown in Table 1. The K applied reflects its useas part of a complete formulation in the first application. Farmers applied 81% asmuch N to the ratoon as they applied to the second planted crop.The ratoon crop is harvested 100-110 d after cutting. The 1985 ratoon crop washarvested before December in both sites, which made it possible to start the springcrop on time the following year.Ratoon vs planted cropSeveral authors have tried to compare ratoon vs planted crop, usually relatingratoon yields and growth duration to those of the main crop. A recent review showedthat ratoon yields varied from 0 to 140% of the main crop, and days to maturity