Study On Physiological Characteristic And Dry Matter Accumulation Of Close Planting And Sparse Planting

China is facing the problems of inconsistency of food supply and demand for long. Fortunately, the super high-yield crop production is put forward to improve the critical situation. System research of high yield maize varieties individual and mass of quality features is helpful to increase our understanding of corn yield potential. The experiment material is close planting and sparse planting.The test comparative study the difference of stem type characteristics and physiological characteristic and dry matter accumulation and yield between close planting and sparse planting. Aims to large area production for provide the theory basis for Jilin province. This conclusions are as follows:1 The plant height of six test materials between 233.1(cm) and 317(cm), the ear height of them between 122(cm) and 184(cm), the difference of plant height and ear height was not significant. All varieties are medium height or higher height, they are have a great potential for high yielding and lodging-resistance are higher.However, the ear position coefficient of six test materials from high to low is Changcheng799>Sanbei9>Qinlong13>Zhengdan958>Xianyu335 >Xianyu420; the stem diameter coefficient of six test materials from high to low is Zhengdan958>Xianyu335>Xianyu420>Changcheng799>Qinlong13>Sanbei9.2 The LA per plant of six test materials showed the curve of'S'in the growing process, the change of LA of each maize varieties from high to low is Xianyu335>Xianyu420>Zhengdan 958>Changcheng799>Qinlong13>Sanbei9. The trend of yield of all varieties are consistency. Experimental explain the higher LA, ensure the higher yield.3 The LAI of six test materials showed the curve of'S'in the growing process. The LAI of close planting higher sparse planting from 39.61%to 49.47%in the filling stage. Even the late growth stage, the close planting higher the sparse planting from 0.9 to 1.6. Close planting has higher photosynthetic potential and it's also explain why the close planting has higher yield than sparse planting.4 The photosynthetic potential of six test materials changed as a single peak curve in growing process. After the tasseling stage, the photosynthetic potential of close planting of themselves more than 70%. It's explain close planting have higher photosynthetic potential on key stage, it's why the close planting have higher yield.5 The dry weight per plant of six test materials patterns is s type cure in growing process. The dry weight per plant of sparse planting higher than the close planting, but the dry matter weight of population are opposite. It's explain group advantage of close planting higher than sparse planting at suitable density.6 The leaf dry weight per plant and each joint position of six test materials changed as a single peak curve in growing process. If with each maize varieties of maximum leaf dry weight as the center, up and down the corresponding joint position leaf dry weight are relatively close. The joint position of each maize varieties are inconsistency.7 The leaf sheath whole plant and each joint position are consistent to leaf. Only the maximum appeared in advance. If add the leaf and leaf sheath get the value. Its change trend and leaf similar.8 The dry weight of whole and each joint position of six test materials changed as a single peak curve, the maximum present to August one.9 The dry weight of female ear of six test materials showed an increasing trend all along in growing process. On September one, the dry weight of female ear per plant of sparse planting less than close plantings, but the dry weight of female ear population of close planting higher than sparse planting. At earlier growing stage, the hypogyny female ear are higher than upper female ear. As the days advance, the dry weight of upper female ear more than hypogyny female ear quickly, then become the effective ear. However, the hypogyny female ear stopped growing.10 At earlier growing stage, the growth center of six test materials is leaf. As the days advance, the growth center is leaf and leaf sheath and stem. At late growth stage, the growth center is grain. The tassel of all maize varieties from July 4 began to grow, in July 18 achieve maximum. In July 18, the tassel of Changcheng799 proportion of whole plant is the highest of six test materials, it's 10.89%. And then, the proportion of all maize varieties began to decrease. Among them Xianyu335 and Xianyu420 to minimize, value is 0.92%and 0.58%.11 The production of six test materials from high to low is Xianyu335>Xianyu420>Zheng-dan958>Changcheng799>Qinlong13>Sanbei9. The experiment explain the yield of close planting higher than sparse planting.The highest yield is Xianyu 335, the lowest yield is Sanbei 9. The highest higher minimum 32.25%.