| Because of the handicap of thin soil layer and infertile of sandy chestnut soil and uneven distribution of the rainfall in crop growth stages,in north-west of Hebei plateau, the agricultural production was low and unstable in this region. Mini-watermelon with thin planting had the special property of resource utilization which is larger spacial area above the ground and small root area underground. In the research, the experimental soil was sandy chestnut soil, which was accounted for 2/3 of whole cultivated area in north-west of Hebei plateau and the tested materials was Mini-watermelon.The effects of irrigation and film mulching treatments on the yield, quality of fruit and water use efficiency of Mini-watermelon were studied in the ridge culture and film mulching on furrow system. The main results were as follows:(1)Under different irrigation treatments, the two varieties of Mini-watermelon are the highest economic output W3 treatment. No film processing yield were 20077.74 and 20309.33kg·hm-2; white film treatment yield were 23708.74 and 23982.22kg·hm-2; black film treatment yield were 23817.73 and 24093.63kg·hm-2. W1 treatment compared with the corresponding increase of 26.65% and 18.62%; 29.30% and 21.55%; 26.07% and 17.98%.(2) The treatment of W3 was the best appearance for two kinds of mini-watermelons under different irrigating and film mulching conditions. The edible part of the W3 treatment was increased by 7.69% on average than the part of W1 treatment for the kind of"Jiu-Yi", and that was increased by 4.94% for the kind of"Hao-Yun-Lai". For the nutritional quality parameters of two kinds of Mini-Watermelons, the treatment of W3 was higher than that treatment of W1. For the kind of"Jiu-yi", the content of the soluble solids in the center and the edge of the fruit and the content of the soluble sugar were increased by 11.96%, 21.35% and 20.48% on average, respectively. For the same parameters of the kind of"Hao-Yun-Lai", the W3 treatment was increased by 11.91%, 8.90% and 17.81%, respectively.(3) During the whole growth period, the storage of soil water in the depth of 060 cm decreased significantly in the fruit formation stage for different treatments of the two types of Mini-Watermelon. For these two kinds of watermelon, they have the maximize water consumption between the stage of vine-extending and fruit formation and the water consumption of white film treatments during this stage was the largest. The largest water consumption of the two kinds of Mini-Watermelon, Jiu-Yi and"Hao-Yun-Lai", was 5.13mm·d-1 and 5.40mm·d-1 on average, respectively.(4) Different irrigation, film mulching treatments of two varieties of water use efficiency of Mini-watermelon are W3F2 treatment was the highest, W3AF2 up to 97.70kg·mm-1·hm-2 increased 27.84% than W1AF2. W3BF2 up to 98.84kg·mm-1·hm-2 increased 19.64% than W1BF2.
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