冬小麦对氮素养分吸收分配规律的比较研究

选用１４个在不同时期推广的冬小麦品种进行田间试验，结果表明，冬小麦对氮素养分的吸收累积动态的规律变化是一致的，但在小麦生长的各生育时期对氮素的吸收累积量有所差异。开花期，氮素在穗中的分配比例前期品种低于后期品种；成熟期，滞留在营养器官中的氮量高于后期品种。随着品种的更替，花后吸氮能力增强，氮素利用效率增强，最大吸氮速率出现的时间延迟１０ｄ左右，后期品种对氮素的吸收能力增强。

COMPARING THE PATTERNS OF NITROGEN ABSORPTION AND PARTITION IN WINTER WHEAT IN DIFFERENT AGES

Fourteen winter wheat varieties spreaded in different periods were tested in the field.The results showed as follows:The pattems of nitrogen absorption and accumulation of all varieties were the same,however,there were some different amounts of nitrogen accumulation in each growth period.The partition ratio of nitrogen at anthesis in the former varieties was less than that in the later varieties;however,the residual amounts of nitrogen in vegetative organs of former varieties in ripening stage were higher than that of later varieties.The capacity of nitrogen absorption after flowering and utilizing efficiency of nitrogen were gradually increased,and the maximum absorbing rate of nitrogen was delayed about 10 days.