Research On Quality Evaluation Index Of Irrigation Water On Spring Wheat In Arid Areas With Ridge Tillage And Furrow Irrigation

The indoor experiment of the research is conducted at the test station of the institute of soil and water conservation science in Gansu during November to December in 2013. The experimental chose the organic soil boxes as materials to study on the two dimensional movement of soil moisture. The experiment simulate the law of soil water movement in furrow irrigation, and observe the soil moisture infiltration rules and the moist peak distribution and the infiltration of water changes with time. The outdoor experiment was carried out in the water-saving agriculture and ecological construction experiment demonstration base of hydraulic research institute in minqin,gansu province during March to August in 2014. The study is based on ridge irrigation infiltration and the water flow advance movement rules of the spring wheat. The experiment was composed of indoor and field irrigation experiment. It analyzes the influence of the combination of the technical parameters of furrow(ridge slope, ridge width, groove width, ditch depth) and the technique parameters of irrigation(gully slope, ditch length, channel flow) on the irrigation quality evaluation index, biomass, yield and water use efficiency of the ridge furrow irrigation for wheat, and it further improve the evaluation index system of the quality of the Spring Wheat Ridge irrigation irrigation. It can be summed up the following conclusions :1. In the furrow irrigation infiltration simulation test, the water content of the soil after the water distribution is more close to the field water holding capacity of 23%; The soil moisture content in the overall distribution after irrigation ditch showed infiltration trend, but the soil moisture content in the center groove on both sides of the ridge axis of symmetry monotonically showed decreasing trend.2. The irrigation uniformity of the ridge width and the measuring point appears a negative growth when the other parameters are studied as the fixed value; The irrigation uniformity of the measurement points reduces with the increase of the flow of the channel under the condition of constant surface slope and furrow type; the surface slope and the irrigation uniformity of each measurement point showed negative growth in the same ridge width and ditch inflow conditions.3. Considering the calculated results of the irrigation uniformity, irrigation water use rate, water storage rate and the ridge wet ratio, the ditch length 50 m, groove width 40 cm, channel flow 1.5L/s, field surface slope of 1/1000 of the parameter combination is the optimum combination of irrigation water quality evaluation by doing the field irrigation experiment. Through the calculation of evaluation index for quality of the simplified formula for furrow irrigation, the optimized combination of the calculated irrigation quality evaluation was further verified by the experimental data.4. The irrigation water use efficiency at different growth stages shows a decreasing trend and the ditch length and utilization rate of irrigation water in different growth stages shows a negative growth trend as the ridge width increases when the other parameters are studied as the fixed value; The water storage efficiency of each growing period shows a decreasing trend, and the flow rate and the water storage efficiency shows a negative growth pattern as the ridge width increases in the case of other parameters unchanged, and the T4 treatment was the highest utilization rate of irrigation water.5. Consumption coefficient of water model during growth stages of spring wheat shows that: flowering-filling period > filling-maturity > sowing-seedling stage > heading-flowering period > the seedling-jointing stage > jointing-heading stage. The coefficient of water consumption modulus of various treatments during flowering and filling stage reaches the highest values and varied between 18.91% ~ 22.46%.6. The ditch length 50 m, groove width 40 cm, channel flow 1.5L/s, and field surface slope of 1/1000 of the parameter combination is optimum combination of optimum growth of spring wheat. The average field irrigation water use efficiency of wheat in each growing period is 85.3%, the highest yield is 9142.87kg/hm2, and the highest water use efficiency is 29.18 kg·hm-2·mm-1.