N-（正丁基）硫代磷酸三胺/NBPT
NBPT是土壤脲酶最有效的抑制剂。正丁基硫代磷酸三酰胺作为土壤脲酶抑制剂，高效、无毒，对土壤无副作用，并在土壤中自然分解氨和磷酸铵。NBPT可使尿素N的效率提高30%。
NBPT可按尿素用量的3-5百万分之一流量的比例直接溶解与尿素混合施用到土壤中，也可按适当的比例通过一定的配制工艺获得生长缓释复合肥的效果。这种含NBPT的长期肥料主要用于大田作物和一些种植蔬菜、果园、树木、玉米、小麦、棕榈树等。
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