Effect of Different Irrigation Patterns and Covering Methods on Onion Yield in the Hexi Corridor

Abstract

In order to investigate the influence of the yield and water use efficiency of onions in the Hexi Corridor, this paper tested the yield and water use efficiency of onions in the Oasis by using the early golden dragon onion as a test material and randomly grouped it into different irrigation modes and cover methods. There were five treatments in the experiment, and the dry matter accumulation process of onion was measured in each reproductive period, and the results showed that: The black mulch full irrigation treatment T1 yielded 120393.45 kg⋅ha−1 with an output value of 72236.07 yuan⋅ha−1, while the black mulch moderate loss adjustment irrigation treatment T3 yielded only 61697.39 kg⋅ha−1and 37018.43 yuan⋅ha−1. The yield per square meter, irrigation water use efficiency and water use efficiency decreased with the increase of regulated deficit irrigation degree, and there was no significant difference between black film mulching and transparent plastic film mulching, but they were significantly higher than that of fine sand mulching. The onion yield and water use efficiency indexes were combined, so that the best control of yield could be achieved by covering the onion with black mulch and irrigation throughout the growing season, which is of theoretical guidance and significance for onion cultivation in the Hexi Corridor.