Response of water consumption law and yield of alfalfa in shallow embedded drip irrigation to different irrigation quotas
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Abstract:
To determine the suitable irrigation schedule for alfalfa under shallow embedded drip irrigation in pebbly sandy soil, five irrigat ion quotas ( 22.5 mm, 30.0 mm, 37.5 mm, 45.0 mm, and 52.5 mm) were set in the experiment, and the surface irrigation was used as the control group ( CK) to study the effect of irrigation quota on the water consumption and yield of shallow embedded drip irrigation alfalfa. The results showed that the water consumption intensity of alfalfa in different stubbles under different irrigation quota was expressed as 2nd> 1st> 3rd, and all of them reached the peak value in the bud stage. The total water consumption of alfalfa in differ ent stubbles was expressed as 2nd> 3r d> 1st, and the water consumption was the highest in the branching stage, the initial flowering stage, and the bud stage, respectively . When the irrigation quota was greater than 45.0mm, the increasing trend of water consumption intensity was smaller and similar to that of surface irrigation ( CK) . There was no significant difference in water consumption betw een 45.0 mm irrigation quota and CK ( P < 01 05) . There were no significant differences in total water consumption, total yield and to tal water use efficiency between high irrigation quota ( 45.0, 52.5 mm) and surface irrigation ( CK) , but significant difference was found between low irrigation quota ( 22.5, 30.0, 37.5 mm) ( P < 0.05) . The total yield and total water use efficiency reached the max imum at the irrigation quota of 45.0 mm, increased by 9.05% and 14.54% , respectively compared with the surface irrigation ( CK) . T herefore, it is suitable to select a 45.0 mm irrigation quota and 540 mm irrigation norm for alfalfa in pebbly sandy soil with a sha llow embedded drip irrigation system.
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