Effect Of Seedling Age And Level Spatial Distribution On Yiled And Yiled Formation

The effects of seedling spatial distribution of level and seedling age on dynamics of population and accumulation and translation of dry matters, trait of canopy and panicle traits, grains filling and grain yield was studied by using hybrid rice D you 527 with strong-tillering ability as materials. Furthermore, single plant characters were studied under nonregular spatial distribution of level. The main results were as follows:1. The younger seedling, the more Effective panicles, and the difference was significant. Seed setting rate was obviously affected by seedling age, the average seed setting rate both A2 (seedling age of 50d) and A3 (seeding age of 65) were lowed 9.6% than A1 (seeding age of 35) treatment. The younger seedling, the lower spike lets per panicle, A2 treatment is the lowest one for grain Spike lets. Finally, the difference of grain yield is not significant among seedling age treatments. Relatively regular level spatial distribution (B2, B3 and B4) favored to increase Effective panicles and 1000-grain weight, and obviously added spike lets (grain Spike lets) per panicle and panicle weight. B1 was the highest treatment for seed-setting rate among spatial distribution of level of treatments, and the difference was significance (10%). Finally, the grain yield of B2 treatment was significance higher than Bl.2. The younger seedling, the more stem-tillers number, and the difference was significance. The less regular of spatial distribution of level, the more of colony stem-tillers number and the lower of effective tiller percentage. The difference was significant after 34d transplanting, but it did not reached significant level at full-heading stage. After transplanting, different level spatial distribution gradually showed that tendency, the more nonregular of level spatial distribution, and the bigger of the coefficient of variation. And the differential was significant or very significant after jointing stage.3. The older seedling, the lower plant accumulated dry matters of per area. The positive correlation was significance between export and translocation percentage of stems-sheaths and filled grain Spike lets per panicle, total soluble sugar of A2 treatment was significance lower than the others treatments. Relatively regular level spatial distribution favored to increased dry substance accumulation and net assimilating rate (NAR), and product dry weight per day were higher than Bl treatment. Opposition, excessively regular spatial distribution would reduce dry substance assimilation, the translocation percentage of rice stem-sheaths increased to appease the demands of grains filling4. The sword leaves length of A2 and A3 treatments were significance higher than A1, the effect of seedling level spatial distribution on sword leaf was little. Before jointing...