玉米种肥的施肥种类

 玉米出苗后，初生根较少，吸收养分的能力弱，用速效性化肥作种肥对幼苗的生长发育有良好作用，尤其是施基肥较少的地块。适合于作种肥的化肥很多，如： 

　　1.氮素化肥

　　在基肥施用量少或土壤瘠薄的条件下，用氮素化肥作种肥有显著的增产效果。在氮素化肥中，硝酸铵钙、硫酸铵、氯化铵均可作种肥施用，但应注意用量。

　　2.磷钾化肥

　　玉米幼苗期磷钾肥充足时，对生长有良好作用，苗高、叶大、生长健壮。施用各种磷肥作种肥均有效果，速效性的过磷酸钙和重过磷酸钙最适合做玉米种肥，在缺钾地区，玉米种肥中加入钾肥是必要的，最好用氯化钾或硫酸钾。

　　3.氮磷钾肥配合施用

　　氮磷钾肥配合做种肥施用比单独施用时肥效高。据试验，氮肥单施作种肥平均增产4.2％；磷肥单施作种肥平均增产2.8％；氮、磷、钾肥配合作种肥增产12.2％。

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