冬油菜春后干物质积累与产量的关系

在不同追肥水平和追肥时期条件下，研究冬油菜春后干物质积累与籽粒产量的关系。结果表明：油菜返青期和初花期干物质积累量与籽粒产量呈抛物线型关系，终花期和成熟期干物质积累量与产量呈极显著线性相关；春后各生育阶段干物质净增量与产量呈显著或极显著线性相关。总角果数与返青期干物质积累量呈抛物线型关系，与终花期和成熟期干物质积累量及各生育阶段干物质净增量呈显著正相关。每角粒数与初花期干物质积累量与返青至初花阶段干物质净增量呈抛物线型关系。千粒重仅与终花至成熟阶段干物质净增量呈显著线性相关。较高的追肥量有利于油菜春后干物质积累增加，追肥时期适当推迟干物质积累量提高，以薹花期两次追肥的干物质积累量最高，产量也最高。

Relationship between dry matter accumulation after spring and seed yield in winter rapeseed

The result showed that the dry matter accumulation between turning green to beginning-flower stage was parabolic correlated to seed yield while the dry matter accumulation between ending-flower to maturing stage and net dry matter accumulation during different development stage after spring was linearly correlated to seed yield. Numbers of pod were parabolic correlated to dry matter accumulation at turning green stage, and positively correlated to dry matter accumulation at ending-flower and maturing stage, and net dry matter accumulation during different development stage after spring. Seed number per pod was parabolic correlated to dry matter accumulation at beginning-flower stage and net dry matter accumulation from turning green to beginning-flower stage. 1 000 seed weight was only correlated to net dry matter accumulation after ending-flower stage. As the increasing of the amount of N application and the delaying of N application stage, the dry matter accumulation increased. The treatment which N application at budding and flowering stage respectively resulted in the highest dry matter accumulation and seed yield.