氮肥施用的洽当与否往往是决定水稻高产成败的关键,改进氮肥施用技术是近代水稻栽培技术的中心课题。现就近几年有关这方面的研究结果,对辽宁稻作施肥体系的改革问题略加论述。一、改进施肥法的意义辽宁稻区水田施用氮肥直至七十年代初期,普遍采用“大头肥”施肥法。这是一种以重施分蘖肥为主的施肥体系。在氮肥施用量少的条件下,保证水稻增产曾起积极作用。近年来,氮肥施用量已达高肥水平,采用“大头肥”施肥法,水稻出现了严重倒伏、发病等现象。低温年份由于生育期延迟,又助长冷害发生,限制了水稻进一步增产。 It is often the key to determining the success or failure of high yield of rice in the negotiation of nitrogen fertilizer application. Improving nitrogen application technology is the central task of modern rice cultivation technology. Now in recent years on the research results in this area, a brief discussion on the reform of rice fertilization system in Liaoning Province. First, the significance of improving fertilization method Liaoning paddy field application of nitrogen fertilizer until the early 1970s, commonly used “big fat” fertilization method. This is a fertilization system that relies on tillering. Under the condition of small amount of nitrogen fertilizer, it has played an active role in ensuring the rice yield increase. In recent years, the amount of nitrogen fertilizer has reached a high level of fertilizer, the use of “big fat” fertilization method, rice appeared serious lodging, incidence and so on. Low temperature during the delay due to the growth period, but also contributed to chilling injury, limiting further rice yield.