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(一)小麦的需肥量据河北、山东等地亩产600～1000斤的十七块地综合资料,每生产100斤小麦籽粒,约需吸收氮2.5～2.7斤、磷0.78～1.17斤、钾约1.9～4.21斤,三要素比值约为3:1:3。小麦成熟期,氮和磷约80％分布在籽粒内,钾约70％分布在茎秆中。在一般情况下,谷(籽粒)草(秸秆等)比值约为1:2籽粒生产系数(或经济系数)约为0.33,即小麦籽粒占全株总干重33％。优良的栽培措施可使经济系数提高到0.46以上,需肥
(A) of wheat required fertilizer According to Hebei, Shandong and other areas of 600 to 1,000 pounds per mu yield of 17 comprehensive information, each producing 100 kg of wheat seeds, about the need to absorb nitrogen 2.5 to 2.7 pounds of phosphorus 0.78 to 1.17 pounds, Potassium about 1.9 to 4.21 pounds, the ratio of the three elements is about 3: 1: 3. About 80% of nitrogen and phosphorus are distributed in the grains during maturity of wheat, and about 70% of potassium is distributed in the stalks. Under normal circumstances, the ratio of grain (straw) to straw (straw) is about 1: 2, and the coefficient of grain production (or economic coefficient) is about 0.33, that is, the wheat grains make up 33% of the total dry weight of the whole plant. Good cultivation measures can make the economic coefficient increased to 0.46 above, to be fat