Abstract:

Two wheat cultivars with different spike types, ‘Yannong19’ and ‘Lankaoaizao8’, used as materials, the effect of the different amount of nitrogen and nitrogen fertilizer proportion on the wheat vegetative organs pre-anthesis transport and partitioning of assimilates, post-anthesis accumulation and transfer of assimilates, and grain yield under condition of the field was conducted in this study. Results indicated that, when nitrogen levels was in the range of 225-300 kg/hm2, multi-spike types wheat ‘Yannong19’ and large spike-types wheat ‘Lankaoaizao8’ grain yield were mainly formed by photosynthetic assimilation of green organs after flowering, then followed by distribution of dry matter accumulation before flowering. But the grain yield of large spike-types cultivar ‘Lankaoaizao8’, which more depended on photosynthetic assimilation of green organs after flowering than multi-spike type cultivar ‘Yannong19’. Distribution of dry matter accumulation was only run about 15% of grain yield between them. Two spike types wheat under the storage of material before flowering, mobilized the contributions allocated to grain yield, which were decreased after the shift with the nitrogen. To integrate material operation and yield performance, the nitrogen amount of ‘Yannong 19’ was 300 kg/hm2, based recovery proportion 5:5 was more appropriate. The nitrogen amount 262.2 kg/hm2 for ‘Lankaoaizao8’, its based recovery was more appropriate when the proportion of 7:3.