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《Gansu Agricultural Science and Technology》 2005-01
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A Study of Potassium Fertilization on Plastic Mulched Watermelon in Irrigated Sand Land

LI Yun-xiang, WANG Guang-ying, JIN Qiao(Pingchuan Agri-Tech Extension Center of Baiying, Baiying Gansu 730913, China)  
Experiments of potassium fertilization on plastic mulched watermelon were conducted to determine the effects of fertilizer on growth and development and main economic traits and yield. Results showed that watermelon yield did correlate with amounts of potassium based on certain amounts of nitrogen and phosphorus. Compared to no potassium treatment, the yield and economic values of application K_2O 150.0 kg/hm~2 increased by (8.57%) and (2000.1) yuan/hm~2, and ratio of output to input was 6.67. Watermelon yield still increased when potassium only was applied, but a high yield of 52 500.0 kg/hm~2 that increased by 6.11% over unfertilized treatment was realized when potassium was drilled at stage of melon swelling. Potassium not only makes vine and stem and leaf grow well, but also virus and stress resistance strengthen, resulting in melon yield increase and qualities improvement.
【CateGory Index】: S651
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