很多农民在夏季追肥时,习惯于雨后向地里撒施氮肥,还有的在浇地时,直接撒施,这些做法不仅浪费了大量的化肥,而且会造成严重的污染,因此追肥时,必须讲究科学,才能达到丰产的目的。一、要根据土壤情况来追肥。由于每块土壤的结构各不相同,要根据土壤酸碱度的不同而确定要追施化肥的种类,如低洼碱地要选用硫酸铵等生理酸性化肥;酸性土壤要追施尿素、碳酸氢铵、氨水等碱 Many peasants are accustomed to spreading nitrogen fertilizer to the ground after raining in the rain when they are dressing up in the summer, and others are spraying the ground directly. These methods not only waste a lot of fertilizers but also cause serious pollution, Must pay attention to science, in order to achieve the purpose of yield. First, according to the soil to top-dressing. As the structure of each soil varies, according to the different soil pH to determine the type of fertilizer to be topdressing, such as the selection of low-alkali alkaline ammonium sulfate and other physiological acid fertilizers; acidic soil topdressing urea, ammonium bicarbonate, ammonia Alkali