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试验在1981～1982及1982～1983两年度进行,苎麻年收四次,以尿素作氮源,三个施氮水平处理,即每季麻每公顷纯氮(A)25公斤,一次施完,(B)50公斤分二次施和(C)75公斤分三次施。结果是在所有三个施氮水平上,均以(b)处理的纡维产量、干物产量和植株吸氮量最高,每次收割后进行土壤 NO_3—N 含量分析,发现 B 水平处理含量最高,干物产量和纤维产量,在用氮量不超过 B 水平时,随用氮量增加而增加,在用氮量为 C 水平时下降。
The experiment was carried out in 1981-1982 and 1982-1983. Ramie was collected for four times in a year. Urea was used as nitrogen source and three nitrogen levels were applied, that is, 25 kg per hectare of pure nitrogen (A) (B) 50 kg in two separate applications and (C) 75 kg in three separate applications. As a result, the yield, dry matter yield and plant nitrogen uptake under (b) were the highest at all three N rates. After each harvest, soil NO3-N content analysis showed that the content of B was the highest, The dry matter yield and fiber yield increased with the increase of nitrogen use when the nitrogen content did not exceed B level, and decreased with the nitrogen level of C level.