近年来,随着尿素肥料施用量的增加,在一些地方常因施用不当,引起农作物受害。其中尤以棉花苗期的受害情况更为严重,使成苗率下降,产量降低。为此,我们于1982年在浙江农业大学农场小粉土上和萧山县长河公社的淡涂泥上对棉苗(3～4片真叶)进行了尿素不同用量(5,10,20斤/ In recent years, with the increase of the amount of urea fertilizer applied, the crops are often harmed in some places due to improper application. Especially in cotton seedling damage situation is more serious, so that the rate of seedlings decreased, yield decreased. To this end, we in 1982 in Zhejiang Agricultural University farm on the small silt and Xiaoshan County River commune lightly coated mud on the cotton seedlings (3 to 4 true leaves) for different urea dosage (5, 10, 20 pounds /