Comparative Analysis Of Irrigation Uniformity Of Different Drip Irrigation Belts.
The dripper flow rate is the main influencing factor of drip irrigation uniformity, so the factors affecting the dripper flow can affect the system's drip irrigation uniformity: the system design is unreasonable, resulting in uneven pressure at the beginning of the system, dripper flow difference, drip irrigation uniformity reduction It shows that the pressure loss of the four different types of drip irrigation belts is different under the same tube population pressure, and the pressure loss increases with the increase of the inlet pressure of the tube. Pressure is the main factor affecting the flow rate of the dripper. The dripper flow rate of the four drip irrigation belts increases with the increase of the inlet pressure of the tube, and the increase rate is different; even under the same tube population pressure, the drip flow rate of different types of drip irrigation belts is different. This is related to the deviation of the water head. Reducing the head deviation at the emitter of the system or the irrigation unit is the key to the uniformity of the irrigation of the low pressure drip irrigation system.
The uniformity of irrigation in the drip irrigation belt varies with the pressure of the tube population, the spacing of the drip, and the thickness of the wall of the drip irrigation belt. The uniformity of irrigation in the four types of drip irrigation belts increased with the population pressure of the tube. Under the inlet pressure of different drip irrigation pipes, the uniformity of irrigation of the four types of drip irrigation belts was more than half. However, the trend of uniformity of irrigation water pressure at the inlet of the pipe is different, which is mainly related to the pressure compensation characteristics of different products. The uniformity of irrigation of the four drip irrigation belts increased first and then decreased with the increase of the spacing of the drip holes. In the same interval range, the uniformity increased more than the decrease. To increase the uniformity of irrigation, the spacing of the dripper is reasonable, and the spacing of the dripper is too large to form a uniform soil moist zone; if the distance between the dripper is too small, the amount of the dripper will increase, and the system cost will be increased. The uniformity of irrigation increased with the increase of the thickness of the drip irrigation pipe wall. The increase rate was fast and slow first, and the pipe wall increased to the thickness and then became stable. This may be caused by the difference in the thickness of the pipe wall of the drip irrigation pipe, the change in the geometry of the pipe and the orifice caused by the pressure change, and the different flow rates of the water in the pipe and the orifice.
The average flow data and pressure of the four drip irrigation belts under different tube population pressures were analyzed by regression analysis to obtain the flow equation. The pressure compensation type of the drip irrigation belt can be judged by the flow index. The pressure-compensated drip irrigation belt drip flow is affected by the water supply pressure and the irrigation uniformity is high. The non-pressure compensatory drip irrigation belt drip flow is greatly affected by the water supply pressure. The irrigation uniformity is low.