| The research of photosynthetic response to light in middle arid area of Ningxia proved that, maximum photosynthesis rat, apparent quantum yield, light compensation point, dark respiration rate was greater in booting stage than in pustulation period, dark respiration rate,apparent quantum yield in filling stage, in booting stage was lower than light compensation point in filling stage. Apparent quantum yield range was between 0.038μmol·m-2·s-1 and 0.05μmol·m-2·s-1.Light compensation point range was between 12.47μmol·m-2·s-1 and 45.15μmol·m-2·s-1..Maximum photosynthesis rat range between 30.59μmol·m-2·s-1 and 37.26 μmol·m-2·s-1. Dark respiration rate ange between1.39μ mol·m-2·s-1 and 3.54μmol·m-2·s-1. Local varieties of small red has a high apparent quantum yield,strong ability to use low light intensity, and the introduction of modern varieties grown maximum photosynthetic rate is higher, the ability of using light is strong, andhybrid seed is greater than the conventional ones.The drought zone of middle Ningxia millet photosynthetic rate varies with the growth period that, during the jointing stage, millet had higher photosynthetic rate and then decreased, reached the lowest value at the booting stage, to the maximum during the filling stage and then began to decline. The whole growth period the average photosynthetic rate range was between 16.17mol·m-2·s-1.48 mol·m-2·s-1. In different growth period difference is very big. Differences in maturity is maximum in the late grouting is minimal. There was also a significant difference in the photosynthetic rate among different kind of millet. JinGu21 has maximum differences with other seeds. JinGu29 has minimize differences with other seeds. Correlation analysis showed that, there are very significant negative correlation among photosynthetic rate and transpiration rate, photosynthetic rate and stomatal Conductance. Drought is caused by the stomatal closure is the main cause of photosynthetic rate decrease, so increasing irrigation can raise photosynthetic rate. The study of millet photosynthetic diurnal variation in maturity and grouting period that, the drought zone of middle Ningxia millet Photosynthetic rate decline at noon. Photosynthetic rate of JinGu29 at booting stage appears photosynthetic noon break. Photosynthetic rate of zhangzagu5 at pustulation period appears photosynthetic noon break. Higher temperature, atmospheric drought caused photosynthetic noon break in the summer noon.Growth analysis showed that:the seedling LAI of millet-Xiaohongmao, a local variety, growed faster, and the modern cultivars in booting filling stage has a larger leaf area, the average between 1.58-3.89; LAD in the growth period between 182.19 m2.d.m2 and 413.39 m2.d.m2, he seedling LAD of local varieties was greater, and modern cultivars in booting filling stage was greater.It was beneficial to the production of dry matter and the formation of production. There were two peaks of NAR with the changes in growth period, the first one between jointing and heading stage, the second peak occurs before and after the filling stage. The average of CGR between 14.92 g·m-2·d-1 and24.33 ·m·d-1, and maintained at a high level,the maximum of CGR in filling stage. Correlation analysis showed that:The grain yield is positively correlated with the Pnã€CGRã€RGR and biological yield, therefore, The grain yield can be increased by an appropriate increase in LAI, Pn, CGR and RGR. |
