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 40d seedling age of the Hybrid Medium Indica Rice is good under water-raised seedling conditions,and the yield will reduce obviously when seedling age above 45d.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 nitrogen level.Among affecting factors,the impact of nitrogen(r=0.6795) 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,then is the number of grain,the impact of grain weight 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 become weakened.Under low-level nitrogen conditions,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.The yield of topdressing in different leaf age is as follows:invert 4 leaf time (10521.0 kg/hm²)＞invert 3 leaf time(10483.5 kg/hm²)＞invert 2 leaf time(10314.0 kg/hm²)＞invert 5 leaf time(9834.0 kg/hm²)＞invert 1 leaf time(9690.0 kg/hm²)＞no topdressing(8491.5 kg/hm²).The topdressing impact of different leaf age on the 1000-grain weight is not significantly while on the effective ear and yield is significantly. When topdressing later,the number of grains per spike will increase first and decrease late.Topdressing in invert 2 leaf times will help for gaining an ideal quanty of per spike and higher tillers PTP's,in invert 4 leaf times will help for gaining an ideal yield,in invert 5 leaf times will help for gaining the highest number of population tillers.Research showed that the date of LAI,filling rate,dry matter accumulation and CGR will be biggest,followed by inverted 3 leaf times and inverted 2 leaf times. Grain-leaf ratio is biggest in the inverted 2 and 1 leaf times,and final yield is the biggest in the inverted 4 and 3 leaf times.Reasearch showed that the Hybrid Medium Indica Rice high-yield(10,500 kg/hm²) group quality indicators of Anhui province are listed as follows:(1) The best seedling way is the dry land bed nurturing,seedling age is 40d.(2) Effective ears:2360000.0/hm²ï½ž2600000.0万/hm²;total grains per panicle:163.0 to 172.0;seed-setting rate:52.0%to 58.0%;thousand-grain weight:26.8g～27.2g.(3) Max LAI:7.04～7.48;the quanty of dry matter accumulation of yellow period: 17425.00 kg/hm²ï½ž21466.00 kg/hm²;CGR:16.86gm^-2d^-1～19.50g.m^-2d^-1;filling rate: 0.1400 g/ear.d^-1～0.1500g/ear.d^-1;the highest groups number of stem tillers:4590000.0/ hm²ï½ž4860000.0万/hm²;tillers PTP's:50.0%to 57.6%;grain-leaf ratio:14.90mg/cm². Leaf～16.19 mg/cm².Leaf.(4) Tiller-based fertilizer:heading sprouting fertilizer is 7:3 or 6:4;base fertilizer every hm² is 30000.0 kg or cake fertilizer 750.0 kg;tiller fertilizer:urea 45.0 kg/hm²ï½ž75.0kg/hm².Total volume of heading fertilizer is urea 120.0～150.0 kg/hm²,KCI:150.0～225.0 kg/hm².(5) The best time to topdressing is inverted 4 leaf times and inverted 3 leaf times, followed by the inverted 2 leaf times.