| The potted and field experiments were carried out in the south part of loess plateau with 632mm precipitation each year. Winter wheat (NR9405, 9430, YanshiNo.9, Shaan229, Xinong2208, AifengNo.3 et al) was used as indicating crops to study the physiologic and ecologic difference of nitrogenous fertilizer. The main results showed as follows:1.9430,Xinong2208, YanshiNo.9 and NR9405 belong to comparatively sensitive genotype to nitrogenous fertilizer, which were followed by XiaoyanNo.6 and AifengNo.3. Shaan229 is placed in the middle center. XiaoyanNo.6 belongs to no sensitive genotype typically to nitrogenous fertilizer, and its sensitivity is the least in the seven genotypes.2.Xiaoyan No.6, which reaction to nitrogen of quantity of dry matter accumulation and nitrogen absorbing was not sensitive. Nitrogenous fertilizer had no important effect on its root configuration indexes, such as root volume, total root absorbing area, active root absorbing area and the percentage of active root absorbing area et al, even some indexes was restrained; but some of the root configuration indexes of comparatively sensitive genotype to N dramatically increase, such as Xinong2208, NR9405, 9430.3.The reaction of dry matter accumulation in over-ground of the different genotype to N is different in every growth. XiaoyanNo.6 and NR9405 is comparatively sensitive to N in growth prophase, but 9430, but shaan229 and Xinong2208 is in the growth anaphase; especially the increment and the increasing percentage of dry matter accumulation quantity shows descending trend as the prosecution of growth stages approximately. The increasing extent of 9430 and Shaan229 is the biggest.4.The root dry matter accumulation of different genotype to N has to a certainty difference. Nitrogenous fertilizer can enhance the root growth of every genotype, except for XiaoyanNo.6 in Seedling stage and Reviving stage, but has the restraining effect on root growth in Jointing stage, Anthesis stage, Filling stage and Maturity stage. From the average of different growth stage, we can find that the nitrogen effect on the root of Xinong2208 and Shaan229 is the comparatively little, the biggest is NR9405, and the order of the remains is YanshiNo.9, XiaoyanN6, 9430. Just because of the instability of difference of reaction to N in the root dry matter of different genotype, the dynamic change of the difference in root and over-ground dry matter of different genotype is short of rule.S.According to the analysis of NT, NTE and NCR in different genotype, we divide indicating crops into two types. One influences grain yield by forming and transferring mass production during growth anaphase. The other influence grain yield by transferring of dry matter before Athesis stage during growth anaphase. So we call the former "anaphase assimilation accumulation type", and the latter is called "anaphase matter transfer type". YanshiNo.9, Xinong2208, and 9430 belong to comparatively typical "anaphase assimilation accumulation type". But XiaoyanNo.6 belongs to comparatively typical "anaphase matter transfer type". After comparing the sensitivity of dry matter and N accumulation of different genotype over-ground to nitrogenous fertilizer, we discover that the "anaphase assimilation accumulation type" is comparatively sensitive to nitrogenous fertilizer. While "anaphase matter transfer type" is not sensitive to nitrogenous fertilizer. This may be relation to that the "anaphase assimilationaccumulation type" still absorbs mass nitrogen from medium of soil in order to meet the demand of assimilation. While it is limited for the "anaphase matter transfer type" to absorb nitrogen from medium of soil during growth anaphase stage. It depends on absorbing transfer and reallocation of N. This reactive difference to N between N accumulation and dry matter accumulation over-ground in different genotype winter wheat is approximately same.6.There are some genotype differences of NT and NCR to nitrogenous fertilizer after blooming, the quantity of assimilation of "anaphase assimilat... |
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