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提高灌区小麦氮肥的经济效益,六十年代在中低产条件下,以种肥和拔节前施增产效果最大。进入八十年代后,随着地力和施氮水平的提高,氮肥应是一次深施,还是底追肥结合?氮肥和灌水如何配合?这些都是当前生产中有待解决的问题。 1983年省农技推广站和省粮作所,组织关中10个县区,统一方案对肥水运筹规范进行了协作研究。灌溉方式采取双马鞍型(冬灌、春2叶和春5、6叶灌)和大马鞍(春2叶不
Improve economic efficiency of wheat nitrogen fertilizer in irrigated area, in the sixties under medium and low yield conditions, with fertilizer and jointing before yielding the largest effect. Since the 1980s, with the improvement of soil fertility and nitrogen fertilization, should nitrogen fertilizer be a deep-seeding or top-dressing combination and how nitrogen and irrigation should be combined? These are the problems to be solved in the current production. 1983 Provincial Agricultural Extension Station and the provincial food for the Office, organized Guanzhong 10 counties, a unified program of fertilizer and water operations norms for collaborative research. Irrigation method to take double saddle type (winter irrigation, spring 2 leaves and spring 5,6 leaf irrigation) and the big saddle (spring 2 leaves