【摘要】 本文主要探明以下问题:(1)小麦产量以起身、拔节两个时期追肥的最高。起身以前追肥主要是增加了穗数,起身、拔节两个时期追肥既可增穗又可增加粒数,拔节期以后追肥则主要是增加粒重。(2)籽粒蛋白质含量随施肥时期的后延而增加,土壤肥力水平越高,增长幅度越大。提高土壤肥力和后期补施氮肥是提高籽粒蛋白质含量的可行途径。(3)追肥对小麦产量与籽粒蛋白质含量的效应存在有同步增长的时期,拔节期以前各时期追肥,产量与籽粒蛋白质含量的增长是同步的;拔节期以后各时期追肥,只能提高籽粒蛋白质含量,而不能增加产量。起身、拔节两个时期追肥,产量最高,单位面积蛋白质生产量也最高。更多还原

【Abstract】 This article mainly shows the following questions: (1) The highest wheatyield is at the two nitrogen dressing period that is the stage of gettingup and elongation. Applying nitrogen fertilizer before getting up stage canmainly increase spike number. Applying nitrogen at the getting up stage andelongation stage not only increase spike number but increase the grain num-ber per spike. Applying fertilizer after elongation mainly adds the grainweight. (2) The protein content of the grain is raising with applying fer-tilizer stage being put off. The higher of soil fertility, the larger increaseyield range. It is a feasible road of Increasing the protein content of grainto raise the soil fertility and the dressing in the latter period. (3) theefficiency of Applying fertilizer for the grain yieid and protein contentthere is a synchronous increase period at the stage before elongation. Ap-plying fertilizer at the each stage after elon gation can only raise theprotein content of grain, can′t increase the yield. However at the gettingup stage and elongation stage not oniy yield of grain is the highest butthe protein productivity is also the highest.更多还原