Effects Of Different Fertilization Modes On Ecological Environment And Yield Of Paddy Field

This study adopts plot and field experiment method. With three different kinds offertilization treatments, the changes of the concentrations of ammonium nitrogen andtotal nitrogen in the paddy field surface water, the physical and chemical changes ofpaddy field soil before&after planting, and rice growth&yield traits etc were studied,the influences of different fertilization treatments on the change of rice water&soilenvironment and paddy field were found out and the change rules were concluded,which provides theoretical basis for establishing local quality rice cultivation modesand efficient fertilizer usage methods and meanwhile provides theoretical basis for thetechniques of preventing and controlling the non-point source pollution of rice system.The experiment results are as follows:1. With three fertilization methods, the study on the changes of the concentrations ofammonium nitrogen and total nitrogen in the paddy field surface water indicate: theconcentrations of ammonium nitrogen and total nitrogen after5days of full inorganicfertilizer treatment in paddy field water are only27.13%and24.24%of that in the firstday respectively, the concentrations of ammonium nitrogen and total nitrogen after5days of mixed fertilizer treatment in paddy field water are only35.51%and31.91%ofthat in the first day respectively, and then the downtrend began to flatten. It shows thata lot of nitrogen will flow out of paddy field with runoff water and into waterenvironment within5days of fertilization in paddy ecosystem in case of overlandrunoff due to rainfall etc; as a result, water eutrophication etc occurred. With time goingon, nitrogen will lose less and less with overland runoff extent, which will have lessand less influence on local water environment.2. With three fertilization methods, the study on physical and chemical changes ofpaddy field soil indicates: when base fertilizer used organic fertilizer and additionalfertilizer used inorganic fertilizer, the early organic matter of soil increased by4.16%,soil bulk density lowered by0.06g/cm3which could improve soil permeability and befavorable for rice growth and development.3. With three fertilization methods, the study on rice growth&yield traits indicates:under the precondition of using the same amount of nitrogen, when base fertilizer usedorganic fertilizer and additional fertilizer used inorganic fertilizer for mixed fertilizationtreatment, plant height increased by2.37%averagely, tiller number increased by 33.33%at tillering stage, and chlorophyll increased by4.91%compared with othertreatment methods which could effectively improve various indexes of rice growthtraits and yield traits. The actual yield by mixed fertilization increased by9.0%and9.5%respectively compared with full organic fertilizer treatment and full inorganicfertilizer treatment, which is an effective measure of improving rice yield and fertilizerutilization rate.