Study on the cultivating techniques of Japonica hybrid rice of Dian type at cross area of Indica and Japonica.

Effects of cultivating practices on yields and yield components of Japonica hybrid rice of Dian type were analyzed with the orthogonal experimental design of L9(34) that had 4 variable factors,including variety,seedling age,pure nitrogen and fertilize mode in Mengzi of Yunnan province,where the altitude is 1290m.The results showed that effects of 4 factors on yields had extremely significant levels,and the order was pure nitrogen variety fertilize mode seedling age.The 8th combination with Dianza 32had the highest yields,which combination had 60 days seedling age,and half pure nitrogen of 270kg/hm2 was respectively fertilized as base fertilizer and at 7 days after transplanted.At all combinations,ears and grains per ear had large contribution to the yields,so the coordination of both components should be paid attention to for achieving super high yield in the Japonica hybrid rice production.The effects of cultivated practices on yields and the yield components of hybrid combinations were as the same as the study in Baoshan where the altitude is 1650m.It is suggested that those 3 hybrid combinations had strongly stability and adaptability,which provides the theoretical basis for spread application of hybrid Japonica rice of Dian type in production.