| Drip irrigation technology has been widely used in the world and water saving effect is very obvious. It is a method of irrigation that put the water directly to the roots of the plant through the drops in order to save water. The water utilization rate can reach 95%.By now Underground drip irrigation and low-pressure membrane under drip irrigation technology has been used and studied widely.But the terraces drip irrigation system research is less. Drip irrigation uniformity and drop flow deviation rate are also used to contral the length of the drip irrigation as well as pressure.In this study,we will establish a mathematical model about the drip irrigation uniformity,flow,laying length,head pressure and slop to determine the best head pressure and laying length.It has important significance to guide other similar project.The drip irrigation system experiment mainly includes two parts.One is drip irrigation uniformity and flow test,and other is drip irrigation system of corn field experiment.The test of drip irrigation uniformity and flow is trying to find out the rules and establish the mathematical model by studying the relationship between drip irrigation uniformity,flow,laying length,head pressure and slop.(1)Through the study of drip irrigation uniformity,flow,laying length,head pressure and slop,we can conclude that Slope,length,head pressure,are all impact on drip irrigation uniformity and flow rate. The influence of head pressure is particularly significant. In the flat slope drip irrigation uniformity and flow rate will increase followed the increase of head pressure. But on the unflat slope, uniformity will increases first and then decreases with the increase of head pressure. The average flow rate are positively correlated with the pressure.Flow and uniformity are negative correlated to the length.The uniformity rate is max and then it will reduce with the absolute value of the slope increases.(2)We can know that in the drip irrigation system of corn field experiment maize yield are positively related with drip irrigation uniformity,but the influence wane with the increase of the uniformity. Evenness had less influence on water use efficiency.The change is increase first then decrease. Along with the change of irrigation water yield is increased before they are reduced. Water use efficiency with the irrigation water inversely proportional relationship. What fertilizer rate in the experiment on corn yield and water use efficiency was not significant.(3) Establish the mathematical model by Drip irrigation belt experiment.The model's precision is very high.We can know the best head pressure in the mountain terraces planting according to the model.lt can provide a new train of thought in the mountainous region of drip irrigation planning design for later. |
PDF Full Text Request