Effects Of Planting Methods And Density On Yield Formation And Rice Quality Of Different Types Of Rice Varieties

The experiment was conducted in 2016-2017s at the Anhui provincial academician workstation/Modern agricultural industrial park of fengtai county,Huainan city,Anhui province.Taking the large-panicle indica-japonica hybrid rice varieties Yongyou 2640 and Yongyou 4949,as well as the middle-panicle high-quality edible super rice varieties Nanjing 9108 and Nanjing 505,which have shown good yield characteristics and great potential for yield increase in production in recent years,as the materials.The pot seedling was transplanted by two kinds of row spacing(33+27cm?33cm)and five kinds of planting distance(12.4cm?13.8cm?15.5cm?17.9cm?20.7cm),taking blanket seedling as contrast,systematically studying the production advantages of pot seedling machine insertion technology,and the effects of pot seedling transplanted by wide and narrow spacing on the yield,structure,dry matter production,photosynthetic characteristics,main qualities of rice and characteristic values of RVA spectrum of different rice varieties,making it clear that what is the Suitable spacing of large panicle type indica-japonica hybrid rice and super rice under the condition of pot seedlings transplanted by wide and narrow spacing,in order to provide the basis for the technical popularization and the high yield cultivation of the new type of pot seedling in the new period of agricultural development.The main test results are as follows:1.The effect of pot seedling transplanting density on rice yield and structure was different with the variety type.During Two pot seedling machine modes,the theory of indica japonica hybrid rice production in line with the trend of the actual production and under the same planting distance processing,pot seedling spacing machine plugged into the theory of yield and actual yield were higher than pot seedling space such as machine processing and carpet seedlings machine processing,the average yield by 5%to 8%,indica japonica hybrid rice in K2 and D2 treatment(highest planting distance of 13.8 cm),With the increase of density,both the theoretical yield and the actual yield of indica-japonica hybrid rice showed a trend of increasing first and then decreasing.Under the two kinds of pot seedling transplanting methods,the theoretical yield of conventional japonica rice was in line with the trend of actual yield.Under the same plant spacing treatment,the theoretical yield and actual yield of pot seedling under the wide and narrow line transplanting treatment were both higher than those of pot seedling and other row spacing transplanting treatment and blanket seedling transplanting treatment,with an average increase of 8%-11%.Conventional japonica rice was treated with K1 and D1(plant spacing of 12.4cm)at the highest level.Under the condition of pot seedling transplanting machine,both the theoretical yield and the actual yield of conventional japonica rice showed an increasing trend with the increase of density.It can be seen that under the condition of pot seedling transplanting machine,conventional japonica rice has a significant ability to withstand dense planting,and has the potential to increase density and yield.Under the condition of pot seedling machine plug,density of indica japonica hybrid rice and conventional japonica rice ear number per unit area and spike grain number effect significantly,with the increase of density,indica japonica hybrid rice and conventional japonica rice considerably increase the ear number per unit area,and the ear grain Numbers per spike,setting rate and are declining,but indica japonica hybrid rice and conventional japonica rice seed setting rate and grain of the differences between different treatment was not significant.In general,the main reason for the increase of yield was that the number of ears per unit area of the whole field was significantly increased by using the wide-narrow-line pot seedling transplanting machine compared with the equally spaced pot seedling transplanting machine and the blanket seedling transplanting machine.2.The effect of transplanting density of pot seedling on the photosynthetic matter production of rice varies with the variety type.The total number of tiller after rice transplanting by two pot seedling transplanting machines was T1>T2>T3>T4>T5 and D1>D2>D3>D4>D5.However,the trend of the blanket seedling transplanting method as the control was consistent with it.The number of tiller of rice in three planting methods reached the peak around jointing stage.The effect of planting specifications on photosynthetic material production of rice varies with planting area and variety type.With the increase of basic seedlings ZaiCha,different types of rice varieties stem tillers number is on the rise in the whole stages,characterized by high density>density>low density,row spacing with enlarged of indica japonica hybrid rice photosynthetic potential big heading to maturity,the attenuation rate of leaf area,population growth rate and net assimilation rate high,middle and dry matter accumulation increased significantly,suggesting that indica japonica hybrid rice with appropriate plant is beneficial to giving full play to the advantages of individual growth,on the basis of guarantee the reasonable panicles,guarantee the population growth.Medium panicle conventional japonica rice varieties were planted with appropriate density to increase the number of basic seedlings in the whole field.Although it would lead to a decrease in the accumulation of dry matter in a single stem and a higher rate of leaf area attenuation,it could give full play to the advantages of population growth and significantly increase the photosynthetic potential,population growth rate and net assimilation rate of the population,which promoted the increase of dry matter accumulation after flowering.3.The effect of pot seedling transplanting density on the main rice quality index and RVA characteristic value of rice varies with the varieties and planting specifications.With the decrease of row spacing and the increase of density,the brown rice rate,white rice rate and whole rice rate of both large-panicle indica-japonica hybrid rice varieties and medium-panicle conventional japonica rice varieties showed a decreasing trend,while chalky grain rate,chalkiness degree and chalkiness size all showed a gradually increasing trend.With the increase of planting density,the protein content of different rice varieties decreased,while the amylose content and gel consistency increased simultaneously.For large-panicle indica-japonica hybrid rice varieties,with the decrease of planting density,the peak viscosity and disintegration value of the three types of mechanical intercropping show an increasing trend,while the subtraction value shows a decreasing trend.In terms of conventional japonica rice varieties with both panicle and grain,the peak viscosity and disintegration value increased first and then decreased under pot seedling transplanting machine,while the peak viscosity increased under blanket seedling transplanting machine as the density decreased.Under the condition of pot seedling transplanting machine,the elimination and decrease first and then increase,while the carpet seedling transplanting machine shows a decreasing trend.4.Comprehensive the above results,the rice pot seedling spacing machine inserted row spacing for 33+27 cm,suitable for supporting both plant growth and lush,big type hybrid rice varieties,give full play to the strong stem,big advantage of the hybrid rice,also for configuration of the hybrid varieties,make up the pot seedling and spaced machine mode to the problem of shortage of basic seedlings,in general,big ear type of hybrid rice varieties suitable for density of K2(13.8 cm)-K3(15.5 cm)density,and panicle type of conventional japonica suitable density of K1(12.4 cm)-K2(13.8 cm)density in order to obtain high yield.