《Table 1 Field trial treatments》

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《"Effects of mulches on water use in a winter wheat/summer maize rotation system in Loess Plateau, China"》

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Note:ARH，agricultural rainwater harvesting.

Ridge-furrow planting，where ridges serve as the ARH zone and furrows serve as the planting zone，was used in the trial（preceding crop was flat planting and had no other water conservation measures）.For the summer maize，each ridge was 60 cm wide and 25 cm high，and each furrow was 60 cm wide.The maize was planted in furrow along two rows at the furrow edges，with 30 cm between each plant.For the winter wheat，each ridge was 30 cm wide and 20 cm high，and each furrow was 30 cm wide.The wheat was planted in each furrow along three rows at two edges and the middle of the furrow，at a seeding rate of 180 kg/hm2.The summer maize and winter wheat were seeded using hole and drill seeding，respectively.The site was divided into 4 m×5 m plots and was surrounded by 2-m strips of the same crop.The plots were separated by 50-cm wide spaces，with plastic film inserted 80 cm into soil to prevent the lateral diffusion of water.Five treatments（Table 1）were set up with different mulching strategies（location lest）in a randomized design with three replicates.Strips of plastic film（transparent and black polyethylene film，1 m wide and 0.008mm thick）were laid tightly against ridge surfaces，and the two edges were covered with soil before sowing.Chopped straw（50 mm long for maize straw and 100 mm long for wheat straw，6000kg/hm2）harvested from the preceding crop（furrows mulched with wheat straw during maize cultivation and with maize straw during wheat cultivation）was uniformly spread in furrows after sowing.Experimental design was the same for summer maize and winter wheat.