Research on the Irrigation Uniformity and Appropriate Irrigation Quota of Subsurface Drip Irrigation of Alfalfa.

In order to study the irrigation uniformity of alfalfa under subsurface drip irrigation and propose a reasonable irrigation quota, this paper uses the method of field experiment, 3 irrigation quotas (20, 25, 30 mm) for subsurface drip irrigation, 2 drip irrigation belts for burial depth (10, 20 cm), and 2 drip irrigation belt dripper flow rates (1.38, 2.0 L/h) are used to study the research, the effects of drip irrigation belt dripper flow, burial depth of drip irrigation belt, alfalfa growth period on irrigation uniformity, and effects of different water treatments on alfalfa plant height and yield. The drip irrigation belt dripper flow has a relatively large influence on the drip irrigation uniformity. Increasing the drip irrigation dripper flow can improve the drip irrigation uniformity coefficient. Under the same drip irrigation belt dripper flow, the burial depth of drip irrigation belt of 10 cm and 20 cm has no significant effect on the uniformity coefficient of drip irrigation. The effect of alfalfa turning green period and flowering period, jointing period and branching period on the irrigation uniformity coefficient is not significant. When the water consumption is 456.69 mm, the hay yield of alfalfa is the largest, which is 12 847.78 kg/hm2. Considering the production factors such as water saving, high yield and high efficiency, it is suggested that the irrigation quota of subsurface drip irrigation of alfalfa in Ordos Otuokeqianqi Area is 25 mm, and the irrigation water is 12 to 14 times. [ABSTRACT FROM AUTHOR]