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本试验在基肥和种肥用量固定的条件下,进行了小麦不同追氮量研定。结果表明:①在供试条件下,小麦追氮量(x)与产量(y)的关系为y=263.94+14.0618x-0.4892x~2,经验证,该回归方程的可靠性达99％以上,可以用来预测。②在基、种肥共施纯氮8.4公斤/亩的基础上,最高产量追氮量为14.37公斤/亩,经济最佳追氮量为11.51公斤/亩,追氮上限为11.08公斤/亩,下限为3.87公斤/亩。③每公斤氮素的增产量随追氮量的增加而减少,约为10.0±1.0公斤/亩。边际利润随2.8公斤/亩氮素的累加而依次下降。追氮总利润在经济最佳追氮量时最大,低于或高于经济最佳追氮量(11.51公斤/亩),总利润都将减少。④在供试条件下,最佳N∶P_2O_5为1∶0.3。⑤小麦追氮量与氮素利用率之间呈显著负相关(r=-0.979)。
In this experiment, the amount of basal fertilizer and fertilizer were fixed under the conditions of different wheat nitrogen recovery was determined. The results showed that: ① Under the conditions of the test, the relationship between the amount of nitrogen (x) and the yield (y) of wheat was y = 263.94 + 14.0618x-0.4892x ~ 2, and the reliability of the regression equation was over 99% , Can be used to predict. On the basis of 8.4 kg / acre of pure nitrogen, the maximum output of topdressing nitrogen was 14.37 kg / mu, the economic best nitrogen recovery was 11.51 kg / mu, the upper limit of nitrogen recovery was 11.08 kg / mu, The lower limit is 3.87 kg / acre. ③ The yield of nitrogen per kilogram decreased with the increase of nitrogen rate, about 10.0 ± 1.0 kg / mu. The profit margin decreased with the accumulation of nitrogen of 2.8 kg / mu. The total profit for chameleon nitrogen is the largest in the economic best chaser, lower than or above the economic best chaser nitrogen (11.51 kg / mu), and the total profit will decrease. ④ In the test conditions, the best N: P_2O_5 1:0.3. ⑤ There was a significant negative correlation between the amount of topdressing nitrogen and nitrogen utilization (r = -0.979).