碳酸氢铵已在农业生产上广泛应用。但如何施用才能收到投资小、见效大的增产效果呢?近年来,我们在玉米上作了施用碳酸氢铵的试验,结果表明,碳酸氢铵在玉米拔节期作追肥比作底肥效果好(如表)。一、从玉米的需肥规律看,作追肥比作底肥好。玉米苗期需肥较少,三叶期以前依靠种子本身养分,待次生根长出后才从土壤中吸收养分。此时,土壤中的养分和当年施入的农家肥是可以满足其需要的。过早施入碳酸氢铵,由于苗小根小,吸收面积小, Ammonium bicarbonate has been widely used in agricultural production. However, how to apply in order to receive a small investment, effective large yield effects? In recent years, we made a test on the application of ammonium bicarbonate corn, the results showed that ammonium bicarbonate in the corn jointing stage than for the top dressing fertilizer effect Such as table). First, from the rule of corn’s need for fertilizer, as dressing than fertilizer for the end of good. Maize seedling needs less fertilizer, three-leaf period before relying on the seeds of their own nutrients, until the secondary root grows from the soil to absorb nutrients. At this point, the nutrients in the soil and the manure applied in that year can meet their needs. Ammonium bicarbonate premature, due to small seedlings small, small absorption area,