This study clarified the applicability of micro-sprinkler irrigation under plastic film (MSPF) in a greenhouse and finding the optimal micropores group spacing and capillary arrangement density. The effects of different micropores group spacing (L1: 30 cm micropores group spacing, and L2: 50 cm micropores group spacing) and capillary arrangement density (C1: one pipe for one row, C2: one pipe for two rows, and C3: one pipe for three rows) with the MSPF on the growth, quality, yield (Y), and water use efficiency (WUE) of tomato were studied. A completely randomized trial design was used, and drip irrigation under plastic film and micro-sprinkler irrigation were used as controls. The results showed that MSPF in a greenhouse can lead to saving water, increase yield, and improve crop quality. Compared to 50 cm micropores group spacing, 30 cm was better for tomato growth and also increased fruit quality, yield, and WUE. Considering our results comprehensively, the combination of one pipe for two rows under a micropores group spacing of 30 cm is recommended as technical parameters for greenhouse tomato cultivation under MSPF in arid and semi-arid sandy loam soils.
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