Author has analyzed the category, characteristic and manure spreading superiority for liquid fertilizers-liquid ammonm, ammonmm ni-trate and urea solutions ; has introduced the production, manure spreading quantity of liquid nitrogen fertilizer and the scale/expense for piping transport ; has discussed the developing progress, present technical situation of liquid ammonia product, manure spreading area and production increasing rate of plants by manure spreading in China ; has presented the suggestion that the kinds of liquid fertilizer should be greatly developed and applied from aspects of demonstration base, suggesting kinds, process technology and preferential policy and so on, in order to realize the food production increasing and energy saving in a wider extent.%分析了液体氮肥——液氨、硝铵尿素溶液的分类、性质和施用优势；介绍了美国液体氮肥的产量、施用量以及管道输送的规模和费用；论述了我国液氨产品的发展历程、技术现状、施用面积和施用作物增产率：从示范基地、推荐品种、工艺技术和政策优惠等方面提出了我国应加快研发、推广和使用液体氮肥的建议，以更大程度地实现粮食的增产与能源的节约。
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