Studies On The Density And Fertilizer In Super High Yielding Of SRI Of The Medium And Big Seedlings

With the medium and big seedlings of rice as material,from the aspects of raising seedlings,density treatments and fertilizer application,the rule of dynamic changes of unit and colony foundation,the characteristics of source,sink,stream and grain yield were studied.The results showed as follows:1.Rice seedling quality was effected by raising ways,seeding quantity and transplantation specification.The best raising way was two-segment raising,as the follow was drought raising,and the last was film raising.But drought raising had the characteristics of great potential in root and tiller,fine comprehensive quality,easy operation,saving labour and land.So the optimum raising way was drought raising by this experiment.While seeding quantity decreased and transplantation specification increased,rice seedling quality improved.The optimum technique to raising medium seedling as follow:the seeding quantity was 20 g/m~2 under drought raising and film raising,the transplantation specification was 4.5 multiply 4.5 cm under two-segment raising.The optimum technique to raising big seedling as follow:the seeding quantity was 10 g/m~2 under drought raising and film raising,the transplantation specification was 6.3 multiply 6.3 cm under two-segment raising.2.High yield of transplantation treatments of different seedling age could get through adjusting the density under SRI.While transplanting medium seedling,and when the transplantation specification was 30 multiply 30 cm or 40 multiply 40 cm,it could got strong individual and reasonable structure of populations.And the comprehensive effect of indexes in effective panicle,filled grain per panicle, 1000-grain weight,seed setting rate,leaf area index,attenuation ratio of top three leaves,SPAD value and stem bleed were greater.Their yield was extremely significantly higher than the treatment of transplantation specification was 50 multiply 50 cm,but there was no significant difference among them.So the medium seedling's transplantation specification was 30 multiply 30 cm or 40 multiply 40 cm,and the yield was 9 920 kg/hm~2 and 9 635 kg/hm~2.While transplanting big seedling,and when the transplantation specification was 30 multiply 30 cm,it could get strong individual and reasonable structure of populations.And the comprehensive effect of indexes in effective panicle,filled grain per panicle,1000-grain weight,seed setting rate,leaf area index,attenuation ratio of top three leaves,SPAD value and stem bleed were better than the treatment of 40 multiply 40 cm or 50 multiply 50 cm.Yield was significantly or extremely significantly higher than them.So the big seedling's transplantation specification was 30 multiply 30 cm,and the yield was 9 151 kg/hm~2.3.Yield was affected by effective panicle,filled grain per panicle,1000-grain weight,seed setting rate under fertilizer application.The results showed that yield and the percentage of top three leaves' area in total increased while added the fertilizer application frequency,on the contrary,the attenuation ratio of top three leaves decreased.Yield and effective panicle decreased with reducing the proportion of base fertilizer,on the contrary,filled grain per panicle,1000-grain weight and seed setting rate increased.It was indicated that tillers occurred early,maximum tiller and ineffective tiller increased,SPAD value and bleeding strength decreased,phenomenon of premature senility was serious when the proportion of base fertilizer was too large. Applying the base fertilizer and tillering fertilizer as 7:3,it was benefited to create effective tiller,increase total accumulation of dry matter,but it was difficultly to stable at later.So it was hardly to create high yield.Appling the base fertilizer, tillering fertilizer and panicle fertilizer as 5:3:2,it was benefited to create relatively high yield,but it was not as ideal as appling base fertilizer,tillering fertilizer,panicle fertilizer and spikelet fertilizer as 5:3:1:1.Becuse panicle-spikelet fertilizer was more benefited to increase filled grain per panicle,1000-grain weight,seed setting rate than only panicle fertilizer.In this paper,appling base fertilizer,tillering fertilizer,panicle fertilizer and spikelet fertilizer as 5:3:1:1 was the best fertilizer application mode,and the yield could upto 10 094 kg/hm~2.