Effect Of Irrigation Surface Fertilizer Regulation Of Soil Water And Nitrogen Transport

Drip irrigation is a kind of modern advanced irrigation technology, since its inception, domestic and foreign scholars have carried out extensive research on it, and based on this, the research on soil nitrogen movement in drip irrigation,but the fertilization is mostly using liquid fertilizer drip irrigation, because of its easy to cause the problem of emitter clogging etc. in this paper, through theoretical analysis and field experiment. The innovation lies in the application of surface fertilizer, fundamentally eliminate fertigation liquid is easy to cause the emitter clogging problem,then the research irrigates the technical essential factor differently and applies fertilizer the condition to the holard nitrogen migration rule influence, attempts to give the agricultural production supplies theory and the data reference. In this experiment, I have summarized the following conclusions:(1) the range of drops is 1.6-2.4L/h, on this level the larger range and longer distance of the vertical wetting front migration is, the shorter distance of vertical wetting front migration will be. There is power regression relationship between distance of soil water horizontal movement and time. The greater the drop flow, the greater will the soil moisture content be at the same location. In the distribution stage, if the horizontal and vertical migration distance increases, the vertical migration distance will increase more than the horizontal movement, and the wetting front in the migration process shows the characteristics of fast slow slow. At the end of the irrigation, for drops of high speed, the rate of Nitrate nitrogen transport in soil is low; the content of nitrate nitrogen in the lower level of the wet body is little; the content of nitrate nitrogen in the soil surface has no obvious change with the change of head flow. At the end of the irrigation and the redistribution stage, the emitter flow in the range of 1.6-2.4L/h, we can find accumulation phenomenon of nitrate nitrogen in the horizontal direction, however there is no accumulation in the vertical wetting front.(2) In the range of 2-4L, when the irrigation is done, the volume of soil wetted volume increases with the increase of irrigation amount. At the same location, when the water content becomes higher, the soil moisture content will be higher as well, and the content of nitrate nitrogen in soil increases with the increase of irrigation amount.(3) The earlier the irrigation is, the smaller the moisture soil will be. However, it is wet in the same point of moisture soil compared with latter irrigation. The earlier period of irrigation application, the more uniform distribution of nitrate nitrogen will be in soil, and there will be larger content of nitrate nitrogen in soil profile at the end of drip irrigation.(4) The distribution characteristics of soil nitrate nitrogen in soil are studied by means of different fertilizer application. It is found that the accumulation of nitrate nitrogen in soil was obvious at the level of 6.5-13 g, and that in the vertical direction, there is no accumulation of soil nitrate nitrogen in soil. The greater the amount of fertilizer application, the more nitrate nitrogen in the same point.In conclusion, it is revealing the influence of different irrigation technology elements and fertilization conditions on moisture and nitrate nitrogen transport distribution of drip irrigation mulching fertilizer conditions, which establishes a scientific foundation for further development of farmland fertilization techniques of drip irrigation. The effects of deep application of fertilizer on the soil texture, drip irrigation, and the effects of different fertilization methods on crop biomass and yield are still need further researches.