Study On The Differences Of Dry Matter Accumulation And Senescence After Anthesis Of Spring Maize Under Different Cultivation Modes

Using the xianyu335and jinshan27as material, differences of different cultivation modes on matter accumulation and the senescence after anthesis of spring maize on the farm of Inner Mongolia University for Nationalities located in West Liao he Plain in2011by methods of field experiment and indoor experiment. The result showed that:Dry matter accumulation and max rate per plant were Farmer Mode>High Yield Mode>Higher Yield Mode; dry matter accumulation and maximum accumulation rate and the days of highest increase rate per unit area above ground were Higher Yield Mode>High Yield Mode>Farmer Mode. Dry matter transportation, transportation efficiency and its contribution to grain of vegetative organs were Farmer Mode>High Yield Mode>Higher Yield Mode. The yield of two varieties of Higher Yield Mode were the highest, Xianyu335and Jinshan27yield respectively were15.086t/hm2and15.171t/hm2, which were higher by8.80%and20.58%in High Yield Mode and15.59%and26.95%in Farmer Mode.The process of filling grains of maize under different cultivation modes may be described by the Logistic equation, the final grain growth, the initial grain-filling potential the maximum population grain-filling rate and mean grain-filling rate were Farmer Mode>High Yield Mode>Higher Yield Mode; the maximizing grain-filling time of NH was the fastest, Higher Yield Mode was the slowest. The early-increase period filling rate and fast-increase period filling rate were Farmer Mode>High Yield Mode>Higher Yield Mode, late-increase period filling rate was Higher Yield Mode>High Yield Mode>Farmer Mode. The contribution rate of the dry matter accumulation in the fast-increase period to yield was Higher Yield Mode>High Yield Mode>Farmer Mode. The dehydrating rate in earlier stage was Farmer Mode>High Yield Mode> Higher Yield Mode, the dehydrating rate was Higher Yield Mode>High Yield Mode>Farmer Mode in32-60days after pollination with the big differences among different modes.Leaf area index was Higher Yield Mode>High Yield Mode>Farmer Mode; the peak time of Higher Yield Mode was later by Farmer Mode and High Yield Mode. Leaf senescence rate was Farmer Mode>High Yield Mode>Higher Yield Mode, leaf senescence rate of different layers showed under three-ear-leaves>above three-ear-leaves>three-ear-leaves. Activities of leaf SOD and POD were all Higher Yield Mode>High Yield Mode>Farmer Mode, two kinds of enzyme activity in the peak time of Higher Yield Mode than Farmer Mode and High Yield Mode after the shift; content of leaf MDA was Farmer Mode>High Yield Mode>Higher Yield Mode, gradually increased after silking.Root vigor was Higher Yield Mode>High Yield Mode>Farmer Mode, and decreased with the growth process time, and increased with the increase of soil depth; activities of root SOD and POD were increased first and then decreased, the performance of Higher Yield Mode>High Yield Mode>Farmer Mode; content of root MDA was Farmer Mode>High Yield Mode>Higher Yield Mode, increased gradually after silking, and all decrease with the increase of soil depth.