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运用营养生长积温对冬小麦分蘖的生长发育特点及其Ｃ、Ｎ、Ｐ代谢状况进行分组研究表明：①京郊小麦生产中分蘖的有效营养生长积温临界值约为２５０℃，营养生长积温不足１７５℃的冬前、春生蘖群很难成穗。②分蘖发育成穗及其穗部性状的改良与起身拔节阶段分蘖体内的Ｃ、Ｎ代谢水平密切相关。在良好Ｎ素代谢基础上增加拔节期间分蘖体内的糖分积累既有利于分蘖成穗率的提高，也有利于分蘖穗部性状的改善。③不同蘖群间，Ｃ素代谢优势始终表现为大蘖群＞中蘖群＞小蘖群；Ｐ素营养返青初为小蘖群＞中蘖群＞大蘖群，拔节后呈大蘖群＞中蘖群＞小蘖群，返青—拔节为优势转化阶段；Ｎ素营养的优势转化期同Ｐ素相比明显滞后
The study on the growth and development of winter wheat tillers and their metabolic status of C, N and P using the accumulated temperature of vegetative growth indicated that: (1) The effective temperature of tillering in the suburbs of Beijing suburbs is about 250 ℃ and the cumulative temperature of vegetative growth is less than 175 ℃ The winter before the spring is difficult to become a group of tillers. ② The development of tillers and the improvement of their ear traits were closely related to the C and N metabolism in the tillering stage of the tillers. On the basis of good N metabolism, increasing the sugar accumulation in the tiller during jointing is not only beneficial to the increase of tillering rate but also to the improvement of tillering panicle traits. ③ Among the different tillers, the predominance of C-metabolism always showed as big tillering group> middle tillering group> small tillering group; in early tillering stage of P-type nutrition, small tillering group> middle tillering group> big tillering group, big tillering group after jointing> Middle-tiller group> small tiller group, turning green-jointing stage was the predominant transformation stage; the predominant transformation stage of N nutrition was obviously lagging behind that of P-prime