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植株有效氮水平通常影响着甜菜的质量、蔗糖产量和低质量根冠组织的形成量,为了测定:(1)每个甜菜品种达到最高糖产量所需要的有效氨水平如何;(2)不同品种对氮肥的反应是否相同;(3)根冠组织形成是否因品种而异。作者于1977—1978年在美国蒙人拿州西顿尼(Sidney)的粉砂粘壤土上研究了几个甜菜品种对施用氮肥的反应。研究中以每公顷0～488公斤氮(折亩0～65斤)比率为主区,3～5个品种为亚区。采用列区排列设计。测定了每个处理的块根和蔗糖产量、蔗糖含量、清汁液纯度和根冠组织比率。结果表明所有供试品种对有效N水平的增加有类似的反应。根冠组织生长随有效N水平的增加而直线增加;蔗糖产量和清汁液纯度则直线下降;总块根产量呈曲线性增加。总块根产量随N水平的
Plant-available nitrogen levels usually affect beet quality, sucrose yield, and formation of low-quality root canopy in order to determine: (1) how effective ammonia levels are required to achieve the highest sugar yield for each sugar beet variety; (2) Whether the response to nitrogenous fertilizer is the same or not; (3) whether the formation of root crowns varies with breed. The authors studied the response of several sugar beet varieties to application of nitrogenous fertilizers on silty loamy soils from 1977 to 1978 in Sidney, Montana, USA. In the study, 0-488 kg nitrogen per hectare (0-65 kg acreage) was used as the main area and 3-5 varieties were sub-areas. Column layout design. Root and sucrose production, sucrose content, clear juice purity, and ratio of root and shoot tissue for each treatment were determined. The results showed that all tested cultivars responded similarly to the increase in effective N levels. The growth of root canopy increased linearly with the increase of available N level. The yield of sucrose and the purity of pure juice decreased linearly. The total root yield increased in a curve. Total root yield with N level