The Research On High-Yield Group Quality And Supporting Technical Measures Of Hybrid Medium Indica Rice

The experiment was carried in Fengtai County Rice Original Seed Farm , Anhui Province and Yongfeng subdistrict Uron village,Tianchang City of Anhui Province from April 2006 to October 2007.The effects of different sowing density and seeding age, different planting density and nitrogen level,different nitrogen proportion of the base tiller fertilizer and head sprouting fertilizer, different leaf age to topdress N fertilizer on group quality and yield formation of different technical measures in Hybrid Medium Indica Rice by using"Xinliangyou 6".The results showed that the difference of the Hybrid Medium Indica Rice in yield, group number and quality is little when normal sowing quanty (seedling: field is 1:10,625g/33m~2) and sparsely seeding (seedling: field is1:7,625g/48m~2) under water-raised seedling conditions. The yield will reduce obviously when seedling age above 45d, and the rang of reduction is some little under sparsely seeding. Under long seedling age conditions, the quatily of seedling nurtured by dry land bed way is better than that nurtured by water-raised way ,the group quanty , quality and ultimately yield is also significantly higher than that of seedling moist .The impact of density and nitrogen level on the group quality and yield of Hybrid Mediun Indica Rice is significant. The difference of yield which increased with density and nitrogen level is significant in different density and N level. Nitrogen and density showed very strong interaction effect, low-density (180,000 points / hm~2), yield will increased when nitrogen increased , mid-density (225,000 points / hm~2), yield will reduce when nitrogen increased ,and higher density (270,000 points / hm~2), yield will increase when N fertilizer increased .Among affecting factors, the impact of nitrogen (r = 0.67953) is stronger than density (r = 0.63195) on the the yield. Among yield constitution factors, the influence on the yield of effective ears is greater, and then is the number of grain; grain weight impact is relatively small.Research show that to increase nitrogen level and density will benefit for the number of effective ears and the relevance of nitrogen and ears is bigger than density and ears. With density increased, the impact of nitrogen on the yield will weakened gradually. Under low-density, the difference of the number of grains per spike is significant, and with the density increase, the difference becomes weakened. Under low-level nitrogen, the difference of the number of grains per spike under different density conditions is not significantly, with nitrogen level increased, the difference of different density become significant. Thousand-grain weight and density are related but were less affected; nitrogen level was positively correlated to thousand-grain weight significantly.Research show that the impact of nitrogen on the dry matter accumulation is significant when low-density, while the impact is not significant when high-density. Low-density and high-level nitrogen, mid-density and mid-level nitrogen will benefit for the dry matter accumulation, low-density and low-level nitrogen, high-density and high-level nitrogen will not benefit for the accumulation . Nitrogen is helpful for the filling rate, the treatment of high-level nitrogen which the ovearall rate of filling is high and in the later period the filling rate also can be maintained at a high level.Under high-yield cultivation conditions, in order to meet the needs of the latter part of the growth and development, the former fertilizer must be properly later moved. The reasearch showed that the yield is the highest when the ratio of the base-tiller fertilizer and heading-sprout fertilizer is 7:3 and 6:4. The former fertilizer later moved is good for the population total tillers, and also for raising the population tillers PTP's, LAI ,CGR,grain-leaf ratio, filling rate and final yield .