砂质潮土小麦成穗规律及其增穗途径的研究

Study on the Regularity of Wheat Earbearing Tiller and the Ways of Increasing Spikes in Sand Soil

经过２年对砂质潮土小麦分蘖力、群体动态及成穗特点的研究表明，砂质潮土小麦具有较强的分蘖能力，可达到高产水平所需的群体头数，但其分蘖下降死亡快，成穗率低。在小麦生长前期施用较高水平氮肥也不能满足小麦后期生长需求，而加强起身—拔节期的肥水管理是该区增加单位面积穗数的主要途径。

The result of twoyear study on wheat tiller ability, population dynamics and character of bearing spikes in sand soil shows that winter wheat has greater tiller ability and can achieve the population that gains high yield, but its tillers die rapidly and the number of tillers declines quickly, so the percentage of earbearing tiller is very low. Applying high level nitrogen fertilizer in the initial stage of wheat growth cannot meet its need in the later stage of growth. Therefore, attaching great importance to fertilization and irrigation from reviving to jointing stage is the main way to increase per unit area nember of spikes in the soil. 