小麦灌浆期间营养器官对籽粒氮积累的影响

THE EFFECT OF NUTRITION ORGANS OF WINTER WHEAT TO THE ACCUMULATION OF N SUBSTANCE IN SEED DURING THE FILL PERIOD

小麦灌浆期间叶片、颖壳、茎秆、叶鞘分解输出的氮素约占籽粒积累氮素量的60%～73%;各器官对籽粒含氮量的贡献依次为叶片>茎节>颖壳>叶鞘。施N量0～10.5kg/亩,各营养器官在灌浆初期含氮量均提高,最终输出率也相应提高;施N量超过10.5 kg/亩,最终输出率反而下降。

During the fill period of winter wheat, as time goes on, the protein N in seed continues to in crease while the non-protein N continues to decrease and the latter keeps changing in to the former. 60%～73% of grain protein-N eriginated from the stored nitrogen by blade, clum, glume and sheath before grain forming period. The different amount of nitrogen fertilizer used as based fertilizer increased the nitrogen content of each nutrition organ in grain initial filling period, and the treatment increased the nitrogen transplatation ratio in addition, with the nitrogen appling amount raising, the nitrogen content in each organ raised in succession. Among defineg appling amount scope, the nitrogen utlimated transplantation ratio (NUTR) raised with nitrogen appling amount. If the nitrogen amount beyond the scope, the NUTR decreased of blade.