尿素、碳铵及其配施有机肥对叶菜连续种植的效应

珠江三角洲秋冬季节高强度的叶菜种植中,随着气温降低叶菜产量有逐渐增加的趋势.连续种植4茬叶菜,在磷、钾肥用量一致的情况下,尿素、碳铵及其配施有机肥的试验结果表明:尿素处理的生长状况和产量结果好于碳铵处理,但这种差异随气温降低而逐渐收窄;尿素、碳铵分别配施有机肥的两处理产量差异较小.供试叶菜硝酸盐含量受品种、气温和施肥等方面的影响,配施有机肥具有降硝作用.试验还表明:施肥特别是配施有机肥具有培肥作用,施肥能明显提高土壤有效养分含量.

Effect of urea, ammonium bicarbonate and their combined application with organic fertilizer on successive plantation of leafy vegetables

Abstract: Yields of leafy vegetables tend to increase with temperature decreasing under high-intensity successive plantation in winter in Pearl River Delta Area. Under the condition of four successive plantation of leafy vegetables with the same amount of phosphorus and potassium, Urea, ammonium bicarbonate and their combined application with organic fertilizer experiment indicated that growth and yields of leafy vegetables in the urea treatment was better than those in ammonium bicarbonate treatment, but the difference declined with temperature decreasing. Little difference was obtained between treatments of Urea and ammonium bicarbonate combined application with organic fertilizer respectively. The nitrate content of leafy vegetables was affected by the difference in variety, temperature and fertilization, and Urea, ammonium bicarbonate combined application with organic fertilizer tended to reduce the nitrate contents. In addition, under continuous leafy vegetables cropping, combining application of organic and inorganic fertilizer could improve soil fertility.