With 3 factors and 5 levels of the secondary regression of orthogonal block design, artificial water control experiments in the shed of rain-free condition were conducted in the semiarid cold region of northwest of Hebei to analyze the effects of different water-fertilizer coupling on soil nitrate accumulation (0 ~ 40 cm depth) in celery harvest period. The results showed that: ①To high, moderate, low water-fertilizer coupling, higher fertilizer and higher water treatment reduced accumulation of soil nitrate while higher fertilizer and lower water treatment accumulated more soil nitrate. With the increase of single factor, the effects of N, P and W on soil nitrate were increasing, unobvious and decreasing respectively. ②Under three factor coupling, soil nitrate increased with N increases under the same P and W level; nitrate decreased with W increases under the same N and P level; while nitrate was uncertain with P increases under the same N and W level. Nitrate accumulation increased with depth in all treatments, which shows the leaching effect of water on soil nitrate.
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张洁瑕,刘树庆,宁国辉,崔邢涛.不同水肥耦合对西芹收获期土壤硝酸盐累积的影响[J].土壤,2009,41(4):641-648. ZHANG Jie-xia, LIU Shu-qing, NING Guo-hui, CUI Xing-Tao. Effects of water-fertilizer coupling on accumulation of soil nitrate in celery harvest period[J]. Soils,2009,41(4):641-648