Study On Water-Fertilizer Management Method Of Summer Maize Production Aided By CERES-MAIZE Simulation Model In Huang-Huai-Hai

The CERES-MAIZE simulation model in DSSAT35 system was calibrated and validated with the localization, and the summer maize water-manure optimum management technology system in Huang-Huai-Hai plain was set up based on CERES-MAIZE simulation model, Uniform Design method and theory of optimization. Then the corresponding soft was developed with DSSAT35, Uniform Design analyse software, Excel solving software for foundation by using data sets of 3 years obtained in Quzhou experiment state. The method of water manure optimum management decision of Uniform Design combined with CERES-MAIZE simulation model was set up for the first time whether at home or abroad at the same time. Cultivar parameter revised and field experiment method were put forward based on the practicability of simulation model, and then the cultivar parameters of two summers maize were provided on this basis. Water-fertilizer optimum management analysis was carried on on high basic soil fertility and low basic soil fertility respectively with Nongda108, in arid year of 1997, rainfall moderate year of 1998 and rainfall excessive year of 2003. The results showed that:1) High basic soil fertility Irrigate water for two to three times in the whole growth time and the total pour water capacity in 230-280mm were suitable when the summer maize's pour water can be insured in arid year. And irrigate water is particularly important in node elonggating and tasseling stage. It may not be irrigated in moderate or excessive rainfall years when the summer maize was sowed in full basic soil water.2) Low basic soil fertility In 1997, the arid year, when irrigation and nitrogen were applied two times respectively in the whole growth time of the summer maize, irrigation and fertilizing nitrogen at sowing and earlier of tasseling stage were particularly important. And irrigation water 115-120mm and applied nitrogen 145-180 kg/ha were comparatively suitable. When irrigation three times and nitrogen were applied two times respectively in the whole growth time, irrigation at sowing, node elongating and tasseling stage and fertilizing nitrogen at sowing and node elonggating stage were particularly important. And 210-235mm and 140-210 kg/ha were suitable in the whole growth time. In 1998, the rainfall normal year, irrigation 45-65mm and applied nitrogen 90-140 kg/ha were suitable in the whole growth time, and irrigation and fertilizing nitrogen at node elonggating stage were particularly important. In 2003, the rainfall excessive year, applied nitrogen 90-120 kg/ha was suitable in the whole growth time, and fertilizing nitrogen from node elonggating to tasseling stage were particularly important considering rainfall in the whole growth time.