Effect of Different Irrigation Patterns and Covering Methods on Physiological characteristics of Onions Under Membrane Drip Irrigation

In order to investigate the influence of the physiological characteristics of onions in the Hexi Corridor, this paper tested the physiological characteristics 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 physiological characteristics of onion was measured in each reproductive period, and the results showed that: The net photosynthetic rate, stomatal conductance, and intercellular CO2 concentration all decreased with increasing amplitude of the transfer loss. Although the net photosynthetic rate, stomatal conductance, and intercellular CO2 concentration of black mulch T1 were higher than those of transparent mulch T4, there was no significant difference between the two treatments, and the net photosynthetic rate, stomatal conductance, and intercellular CO2 concentration of T1 and T4 were significantly higher than those of sand mulch T5. The physiological characteristics of the onion can be best controlled by irrigation while covering the onion with black mulch throughout the growing season, which is of great significance for onion cultivation in the Hexi Corridor.