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化肥深施是提高化肥利用率的主要技术措施.是借助于施肥机具来完成的。氮肥主要用于追肥。应将氮肥定量、均匀地施入土中6～8厘米深处,及时覆土压实。选用氮肥追肥机时要了解其排肥器是否能可靠地排施粉状氮肥如碳酸氢铵,或小颗粒状氮肥如尿素等。特别应注意的是否能适应碳酸氢铵的排施。由于碳酸氢铵是目前我国的主要氮肥品种,一方面有价格便宜、肥效快、不残留有毒物质等优点,另一方面又有易潮解、粘结造成机械排肥时的架空、堵塞而使施肥机无法
Deep fertilizer application is to improve the utilization of chemical fertilizers the main technical measures is to use fertilizers to complete. Nitrogen fertilizer is mainly used for dressing. Nitrogen fertilizer should be quantitative, evenly applied to the soil 6 to 8 cm deep, timely soil compaction. When using nitrogen fertilizer to top-dressing machine to understand its fertilizer can reliably discharge powdered nitrogen such as ammonium bicarbonate, or small granular nitrogen such as urea. Special attention should be paid to meet the ammonium bicarbonate emissions. As ammonium bicarbonate is currently the main nitrogenous fertilizer species in our country, on the one hand, it has the advantages of cheap price, fast fertilizer effect, no residual toxic substances and the like. On the other hand, Machine can not