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一、小麦1、华北平原灌溉冬小麦区。包括山东省和天津市全部,河北省中南部,北京市中南部,河南省中北部,陕西省关中平原,山西省南部。(1)施肥管理原则1根据苗情长势,分次施用氮肥,适当增加拔节中后期的施用比例;根据底(基)肥施用量、苗情、温度以及土壤肥力状况科学确定追肥用量和时间;因地、因苗、因时追肥。2根据土壤墒情和保水、保肥能力,合理确
First, wheat 1, North China Plain irrigation winter wheat area. Including Shandong and Tianjin all, central and southern Hebei Province, central and southern Beijing, central and northern Henan Province, Shaanxi Province Guanzhong Plain, southern Shanxi Province. (1) Fertilization Management Principle 1 According to the growth of the seedling situation, the nitrogen application rate should be divided into different levels to increase the proportion of middle and late stages of jointing. The amount and time of top dressing should be scientifically determined according to the application rate of bottom (base) fertilizer, seedling temperature and soil fertility. Due to ground, because of seedlings, due to top dressing. 2 According to the soil moisture and water, fertilizer capacity, reasonable indeed