甜菜与氮肥 就甜菜作物的特点而言,它以积累蔗糖为主,因而需要摄取大量的氮素,用以建造绿色体制造碳水化合物。氮素不仅是甜菜生理上和营养上极其重要的一个元素,而且还贯穿于甜菜全部糖代谢的始终。一句话,氮素对甜菜的产量和含糖量都起着十分重要的作用。 但有人认为大量施用氮肥时也会发生各种麻烦,其原因之一,在于地上部茎叶徒长,繁茂的叶片相互遮阴加重而破坏了P—R的平衡(光合作用与呼吸作用之间的平衡)。氮素是蛋白质的基质,而蛋白质的合成是利用贮存的或当时生产的碳水化合物进 Sugar Beet and Nitrogen Fertilizer In terms of characteristics of sugar beet crops, it accumulates sucrose, which requires a large amount of nitrogen to build green bodies to make carbohydrates. Nitrogen is not only an extremely important physiological and nutritional element of sugar beet, but also runs through the entire sugar metabolism of sugar beet. In short, nitrogen plays a very important role in sugar beet production and sugar content. However, some people think that when using nitrogenous fertilizer in large quantities, various troubles will occur. One of the reasons is that the leaf stems above the ground are long and the leafy leaves of the aboveground are shaded each other and the balance of P-R is damaged (the relationship between photosynthesis and respiration balance). Nitrogen is the substrate of proteins, and the synthesis of proteins utilizes either the stored or then produced carbohydrates