The Effect On Yield And Quality Of Southern Season Double Late Japonica Rice With Different Density Treatment

The studies were carried out in jiangxi province during2010-2011, using Nanjing44、 Wu24、Yongyou8and Yongyou9as materials, design five density treatments, study of different densities on double season japonica rice yield and its components, as well as the quality of rice population impact on rice quality. The main results are as follows:1、In the experimental density range, double-cropping late rice yield and density showed a quadratic relationship between the yield as the density increased first and then decreased. In conventional rice planting density of1200,000per hectare yield was the highest level (8535.76kg/hm2), while hybrid rice planting density of900,000per hectare yield was the highest level (9488.61kg/hm2), and density were associated with other treatments a significant difference. As the density increases, the increase in per acre ears, reduce the number of grains per panicle, group spikelets first increased and then decreased, seed setting rate decreased, no significant variation of grain weight, grain weight yield components, in addition to significant differences between treatments outside.Also at the same density conditions, hybrid rice yield than conventional rice yield.2、In the experimental density range, double-cropping late rice tillers number in each growth stage as the density increases, but the final spike rate decreased with the increase of the density, and the four varieties are in the density of600,000per hectare level of the highest rates of tillers: Nanjing44was76.49%, Wu24was86.58%,67.59%Yongyou8, Yongyou9is70.91%. The same density level, double-cropping late rice tillers with the growth over the first increases and then decreases, and are in the jointing stage tillers max. At the same time under the same density, hybrid rice at each growth stage the number of tillers than conventional rice is high.In the experimental density range, double-cropping late rice dry matter content in the effective critical stage of tillering, jointing, heading the three key growth stages, increasing with increasing density, while the density increases with maturity is first increases and then decreases, and the conic. Density under the same conditions, with the population growth process goes on increasing the amount of dry matter, were the largest amount of dry matter in the mature stage. At the same time under the same density, at each growth stage, hybrid rice high dry matter than conventional rice. In transplanting to jointing, jointing to heading these two growth stages of dry matter accumulation increases with the density, while heading to maturity, dry matter accumulation of this phase increases with the density of the first increases and then decreases, as follows:conventional rice planting density per hectare1200,000maximum amount of dry matter levels, while hybrid rice planting density per hectare900,000maximum amount of dry matter levels. At the same time under the same density, at each growth stage hybrid rice dry matter content higher than conventional rice. Another correlation analysis showed that the amount of dry matter accumulation after heading its accumulation and yield ratio was significantly positively correlated. Rice’s population growth rate refers to the dry matter per unit area on the accumulation rate, population growth rate is to describe and group net photosynthetic efficiency of the important indicators. Correlation analysis showed that, N-n+1to jointing, jointing to heading and heading to maturity stage of its population growth rate is the amount of dry matter accumulation was a significant positive correlation.In the experimental density range, double-cropping late rice leaf area index in the effective critical stage of tillering, jointing, booting with the density increases, but the heading, but with the density increasing maturity was first increased and then decreased trends. At heading and maturity, conventional rice per hectare1200000densities highest leaf area index, and900,000hectare of hybrid rice in the highest density conditions. Same density treatments, leaf area index with the growth goes first and then decreases and both reached the maximum at booting. Groups of hybrid rice tiller leaf area index in the critical stage of fairly conventional japonica rice, while in booting, heading and maturity were higher than conventional rice, the differences were significant.In the experimental density range, double-cropping late rice photosynthetic potential critical stage in the effective tillering to jointing stage increased with the density increasing, but the jointing to heading, heading to milk stage, milky stage to dough stage, wax period to maturity of these four groups of photosynthetic potential phase increased with increasing density increases first and then decreases, conventional rice seedlings per hectare1200000photosynthetic potential treatments largest hybrid rice seedlings in900,000treatments per hectare maximum. Under the same density at each growth stage canopy photosynthetic potential of hybrid rice were higher than conventional rice, the differences were significant. 3、In the experimental density range, grain quality changes with the density of each index showing a certain regularity. As the density increases, brown rice rate, milled rice rate, milled rice rate and declining processed qualitative inferiority, milled rice rate which greatly affected. Density greater impact on appearance quality of rice, chalky grain rate and chalkiness as the density increases, the appearance of a regular quality deteriorates. As the density increases, the protein content decreased, reduced amylose content. Rice processing of different densities RVA Profile property values differs. Mainly as with the density increases, the peak viscosity, hot viscosity, breakdown, final viscosity and pasting temperature characteristic value increases first and then decreases, setback and peak time increased with increasing density of the upward trend.