Research On Yield Formation And Law In Indica-japonica Hybrid Rice Under Different Seedling-age And Basic Seedlings

With the continuous improvement of people’s living standards, more and more attention to health, high quality, safe food, people are increasingly demanding high quality rice, high-quality rice consumption is a growing trend, China’s pursuit of high-yield rice production starting from Vector taking into account the type and quality change. The Japonica Rice processing quality was better than indica rice and a higher economic efficiency, according to local conditions to increase Japonica Rice production,not only increase farmers’ income but also enable to upgrading the quality and quantity. In the implementation of the "reform indica and japonica", there are lots of distinctions of the No. of basic seedlings for the planting when varieties type and seedling age size have a large difference. And a suitable number of basic seedlings is the starting point of the group development that ultimately affect the yield of rice. To this end, the purpose of this test is to ascertain in a high-yield water, fertilizer conditions, research on yield formation and law in Indica-japonica hybrid rice under different seedling-age and basic seedlings, enough provide a theoretical basis for high and stable yield under strong seeding, sufficient spikelets, large spikelet and large grain pattern. The area of this test locate in Junchuan, Suizhou. My test selected Yongyou4949 and Yangliangyou6 two varieties, and then we set three seedling age processing(four-leaf, six-leaf, eight-leaf),each seedling age processing set six basic seedling levels(three density×two the numbers of seedling per hill). The main results are as follows:(1) Tiller dynamic performance advantages: the rapid growth of the productive tiller node, timely enough vaccine to rapid change of steady growth, ineffective tiller less. Peak seedling number is relatively small in the jointing stage and jointing to heading population Tiller’s demise is relatively flat.(2) Yongyou4949 in four leaf of seedling per hole, planted in 3 seedlings, plantingdensity 27 million points / ha, full heading stage of dry matter accumulation biomass and LAI, the highest value is 21.6t/ha, 7.6 and full heading to mature stage dry material production ability was stronger, and LAI regression smooth, population quality is better.(3) With the increase of seedling age, the yield decreased gradually. Four leaf and six leaf heart transplanting seeding age yield was significantly higher than that the eight leaf yield, mainly because of the small seedling age processing high spike rate, total grains per panicle number, seed setting rate.Yongyou4949 in the four leaf of planted in three seedlings per hole, planted in density 27 million points / ha treatment yields the highest value for 13.5t/ha. The average yield of Yongyou4949 for 12.1t/ha, higher of 12% than Yangliangyou6(10.8t/ha), group storage capacity big, and high seed setting rate is Yongyou4949 to get higher yield.(4) Yongyou4949 is dense and big spike type cultivar, per panicle secondary rachis branch number, secondary rachis branch filled grain number and strong secondary rachis branch, higher Yangliangyou6 32.6%, 61.6%, 31.1% respectively, visible Yongyou4949 in productive panicles on the secondary rachis branch the big advantage of the stable increase grain number per panicle to enlarge the base production.(5) As transplanting seeding age delayed, Yongyou 4949 panicle yield contribution rate increased significantly, a tiller production contribution rate decreases, but there was no significant difference, and Yangliangyou 6 main stem spike, a tiller production contribution rate is increasing, the elevated a tillers leaf position, tiller nodes position will continue to reduce. When the transplanting density increased and the number increased, the yield per node of the two varieties was smaller, the yield of different leaves was also decreased, and the advantages of a tiller became lower..These results can provide references for the “indica rice to japonica rice,’ in Hubei region and similar ecological rice areas.However, should be taken into account in the actual production,persisting in "just indica rice if suitable for indica rice and just japonica rice if suitable for japonica rice". Moreover,several questions such as mismatched productionhabits, supporting light and simplified cultivation measures, and so on,were in the way of“indica rice to japonica rice", yet to further study and research.