Study on High Yield Cultivation Technique of Ratoon Rice in the Low Latitude Plateau

In the low latitude plateau,eight high-yield first cropping rice varieties were screened for ratoon rice varieties in 2010,high yield cultivation technology of the highest yield varieties was study in 2011 and the cultivation techniques were integrated in 2012 and 2013.The results showed that:the average yield of ratoon rice was 4.19t/hm2 and 37.08% of the first cropping rice yield.The variation coefficients of 1000-grain weight and seed setting rate were small and those of other yield structure factors were larger.The varieties with more spikelets had higher yield,of which,the spikelets of Yiyou 673 was 2.12104/m2 and its yield was 4.70t/hm2.The key to improve the yield of the ratoon rice was to increase the effective panicles,the key to improve the panicle of the ratoon rice was the improvement of sprouting and alive bud of the ratoon rice.It is necessary to foster much panicle number for obtaining higher yield in the ratoon season.The key technique for high yield was that 97.5kg/hm2 bud fertilizer was used at the 15th day after full heading of the first cropping rice and 97.5kg/hm2 granular fertilizer was used at the 2nd or 3rd day after the first cropping harvest,rudimental stubble height was 30cm,the yield of technology integration was 4.25t/hm2,which created the highest yield record of ratoon rice in low latitude plateau area.