Effects of mulching timing, pattern and color of plastic film on soil moisture and water use efficiency of potato
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Key Words: the Northwest arid region  plastic film mulching  soil water use efficiency  potato
买自珍1,佘 萍1,买 娟2,王 勇3,周皓蕾1,米治明1,陆俊武1,金学平1 (1.固原市农业科学研究所 宁夏 固原 756000 2.宁夏回族自治区地质矿产勘查开发局 宁夏 银川 750021 3.宁夏师范学院 宁夏 固原 756000) 
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      In arid areas of middle Ningxia, two years of field experiments were conducted to elucidate effect of timing, pattern, and film color of plastic mulching on soil moisture, potato yield, and water use efficiency. The results showed that compared with the bare land cultivation, mulching can improve the soil moisture. For early spring double ridges mulching, the water content of 0~100 cm soil were 18.10% and 19.73% for white film and black film, respectively, storing 18.66 mm and 38.46 mm rainwater in the soil. Soil moisture of 0~200 cm depth was higher for mulching treatment during the growth stages of seedling, budding, flowering, tuber growth in 2010—2011. For example, ZBSQ stored 39.23~40.65 mm, 24.51~31.08 mm, and 21.75~30.88 mm. While ZHSQ harvested 56.85~20.21 mm, 37.8 1~-4.72 mm and 29.06~-3.26 mm. In addition, mulching effect was more marked in the 0~40 cm soil profile and 40~80 cm and 80~120 cm. Mulching showed significant effect on potato yield. Early spring mulching with double ridges covered by white film produced 35 007.85 kg·hm-2, being 29.31% higher than that of the bare land, while it had a rainwater use efficiency of 116.35 kg·hm-2·mm-1, increased by 36.15%. Early spring mulching with black film had a yield of 33 823.75 kg·hm-2, increased by 24.9%, and its rainwater use efficiency was 105.7 kg·hm-2·mm-1, increased by 25%. These two patterns are suggested for potato production in middle Ningxia.