The Effects Of Soil Water-Heat-Fertilizer Of Drip Irrigation Under Film On Soybean In Southeast Regions Of Daxing’an Mountain

This paper mainly studies on the soil heat water and fertilizer effect of soybean in Arong Qi, Hulun Buir city, Inner Mongolia drip irrigation under film.The experiment was set up with compared method of same number of irrigation times and different irrigation quota.There were two planting patterns as drip irrigation under mulch and drip irrigation without mulch. Through the analysis of the effect of different treatments on soil moisture variation, physiological indexes, soybean yield, conbine with the weather data of the trial period the main conclusions are as follows.1. Plastic film mulching can convert solar energy into thermal energystorage in the soil and effectively improve the soil temperature insoybean growth period then provide a more favorable environment for thegrowth of soybean. Experimental data show the whole soybean growth period that film covering can accumulated soil temperature by 207.47 ℃-d. Plastic film mulching could significantly promote the growth of soybean and dry matter accumulation was significantly increased.Compared with the traditional cultivation the soybean yield increased by 800kg hm-2.2.Plastic film mulching can reduce soil water evaporation effectively. It influenced soil water content of different depth. On the one hand it would strengthen the gasification process of surface water and deep soil moisture migration obviously. However, because of plastic isolation effectiveness the use of rainfall is lower.But the effective use of micro rainfall can be realized. On the other hand the utilization rate of rainfall is lower if the rainfall is heavy.3.Study on the water consumption regularities of soybean growth period through the water balance method. The analysis showed that the flowering and podding stage water consumption intensity is maximum followed by the filling and branching stage. While the filling, flowering and podding stage water consumption was counts for about 60% of the whole growth period of soybean.lt is aso the sensitive stage of water. Water consumpti modulus of soybean performance filling stage> pod stage> flower stage> branching period> mature period.4.Establishment and analysis the regression models of irrigation amount and soybean plant height crude and leaf area index.The differernt irrigation amount has different effect on the physiological characters of soybean in different growth stages. At flowering and podding stage irrigation could significantly improve the growth of soybean.5.The variation of soybean Kc under film mulch performance as;low in early growthof soybean (0.39-0.51)mid rised (0.82-1.32)and later stagedecreased (0.49-0.64).The soybean Kc value of drip irrigation under plastic film treatment in the seedling stage (late May to mid June) is less than no mulching treatment.But it wasn’t not change much in the mid and late stage.6. Study on the coupling effect of water and nitrogen on soybean through the frequency analysis method showed that soybean yield has a regression relationship between water consumption and nitrogen input.There was a significant effect between soybean yield and the coupling effect of water consumption and nitrogen input. Considering the two factors of water and nitrogen that soybean optimum water consumption is about 369.87-378.98mm andthe optimum amount of fertilization inpu is about98.4-107.7kg/hm2.