施氮量与甜菜产量的形成

试验表明,施氮量与甜菜叶面积、光合势、叶绿素含量均呈显著正相关,与净光合生产率呈负相关,故高氮处理,因叶面积指数和光合势过大,净光合生产率低,不利于产量形成;根产量与施氮量呈二次曲线相关,含糖率与施氮量呈负相关,高氮处理T/R值明显增加,导致根产量和含糖率降低;随施氮量增加,造蜜性物质增加,块根品质降低;本试验以施120kg/ba氮产糖量最高,过量施氮降低产糖量.

The Formation of Sugarbeet Yield and Amounts of Nitrogen Applied

Experimental results shown that: Amounts of nitrogen applied are significant positive correlation with sugarbeet leaf area, photosynthetic potential, chlorophyll content and negative correlation with net photosynthetic production efficiency. As the result, the leaf area index and photosynthetic potential are too high because of the treatment of high nitrogen and led to the decreasing of photosynthetic production efficiency. These are disadvantigeous to the formation of yield; Amounts of nitrogen applied are quadratic curvilinear correlation with root yield and negative correlation with sugar content. The increasing of the value of T/R with high nitrogen treatment led to the decrease of root yield and sugar content; M alter of molasses formation raised along with increasing of amounts of nitrogen applied and led to th decreasing of root quality; In our tests, the sugar yield is the highest when the nitroegen is applied at 120kg per hectare and the application of over-nitrogen will reduce sugar yield.