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种麦底施磷酸二铵(简称二铵),要注意五点:(1)增氮。二铵一般含磷46％左右,含氮18％左右。小麦出苗期需氮量是磷的3倍左右,单施二铵不能满足幼苗对氮的需要,所以要根据前茬作物、土壤状况配合施用一部分氮肥铺底。(2)不宜在碱性土壤上施用。据测定,二铵施入盐碱地土壤后,肥料损失率可达20—50％,为充分发挥肥效,盐碱地最好不用二铵,应改施碳铵和磷酸钙混合肥。(3)不能和碱性肥料混合底施。磷酸二铵为碱性肥料,底施时不能和石
Wheat at the end of DAP (abbreviated as diammonium), pay attention to five points: (1) by nitrogen. Diammonium generally about 46% phosphorus, about 18% nitrogen. Nitrogen demand in wheat seedling stage is about 3 times that of phosphorus. Single diammonium can not meet the needs of seedlings for nitrogen, so according to the former crop, the soil conditions with the application of nitrogen fertilizer bedding. (2) should not be applied in alkaline soil. It is determined that diammonium into the saline soil, the fertilizer loss rate of up to 20-50%, in order to give full play to fertilizer, salt and alkali is best not to use diammonium, ammonium and calcium phosphate fertilizer should be reformed. (3) can not be mixed with alkaline fertilizers. Diammonium phosphate is an alkaline fertilizer, the bottom can not Shi Shi Shi