前言水稻稳产高产需要氮、磷、钾等多种养分协调供应,但目前生产上主要施氮肥,磷肥不多,钾肥极少,出现三要素比例失调,构成影响氮肥肥效充分发挥和提高单产产量的限制因素。为模清营口地区三要素的适宜比例,以达到高产、稳产、优质、低成本的目的,我们先后多年进行以不同水稻品种为主要供试作物的不同土壤、不同肥料配比试 Preface The steady and high-yielding rice needs coordinated supply of various nutrients such as nitrogen, phosphorus and potassium. However, at present, there are few nitrogen and phosphorus fertilizers and few potassium fertilizers in the production. The imbalance of the three elements appears, which affects the efficiency of nitrogenous fertilizer and the yield increase The limiting factor. In order to clear the appropriate proportion of the three elements of Yingkou, in order to achieve the purpose of high yield, stable yield, high quality and low cost, we have carried out different soil with different rice varieties as the main test crops for many years,