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近两年麦田耧施氮素化肥,已在我区小麦增产中起了一定作用,但如何更充分发挥氮素化肥的增产效能,我们从施肥的时间和方法上,进一步作了多点实验,结果如下:一、作底肥比追肥好。据宁县曹家、良平、秦店三个大队农科站在旱塬小麦地试验,用同量的尿素、硝铵做底肥比返青期做追肥,每亩多收小麦二十九点七斤至四十三斤,增产6.8—9.2％;同量的硝铵、尿素一半作底肥,一半作追肥,比全部作追肥每亩多收小麦二十二点六斤,增产5.2％。在我区化肥作底肥增产的原因,初步分析是:施肥后盖土,肥分持续时间长,小麦一扎
In the past two years, the application of N fertilizers to wheat fields has played a certain role in the increase of wheat yield in our region. However, on the time and method of fertilization, we made further experiments on how to give full play to the yield- The results are as follows: First, make fertilizer better than fertilizer. According to Ning County Cao, Liang Ping, Qin three brigade agricultural stations standing on the dry land experiment, with the same amount of urea, ammonium nitrate fertilizer to do more than the youth green, up more than 19.7 pounds of wheat per acre to 43 kilograms, an increase of 6.8-9.2%; the same amount of ammonium nitrate, half of urea as the base fertilizer, half for top dressing, more than all for top dressing more than 22.6 pounds of wheat per acre, an increase of 5.2%. Fertilizer in our area for fertilizer production increase, the initial analysis is: fertilization after the cover soil, fertilizer for a long time, a bar of wheat