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在美国英佩里尔地区,小麦、甜菜和牧草的施肥,历来采用将氨肥注入灌溉水的办法。此法的特点是方便省钱。但是,由于在灌溉和其后土表干燥过程中的氨挥发,造成大量氮肥的损失。近年来,科技人员试验用带有旋转刀(见照片)的播种机,在播种的24同时,将粉态氨和氮肥稳定剂氯定[有效成分是2—氯—6—(三氯甲基)吡啶],注入土壤表层以下,效果较好,甜菜的增产效果尤为明显。 1975—1976年在英佩里尔地区的细沙壤土甜菜地块上进行了试
In the area of the United States, Perpetel, the fertilization of wheat, sugar beet and pasture has traditionally been done by injecting ammonia fertilizer into irrigation water. This method is characterized by convenient and economical. However, due to ammonia volatilization during irrigation and subsequent soil surface drying, large amounts of nitrogenous fertilizer are lost. In recent years, scientists have experimented with sowing machines equipped with a rotary knife (see photo), while sowing 24, chlorine-stabilized powdered ammonia and nitrogenous fertilizers [active ingredient is 2-chloro-6- ) Pyridine] into the soil below the surface, the effect is better, the yield of beet is particularly evident. 1975-1976 In the Perry area of fine sandy loam beet plots were tested