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利用￣(１５)Ｎ同位素进行了土壤盆栽试验，研究了土壤水分胁迫与甜菜吸Ｎ能力、强度及Ｎ素肥效间的关系，明确了：１）土壤湿度为２０％左右时对甜菜的生物效应以Ｎ素为主，反之则以土壤水分为主；２）使Ｎ肥对甜菜有效的最低土壤湿度为１５％；３）甜菜吸Ｎ在各器官中分布比例为，叶：叶柄：根为１０：２：１；４）甜菜吸Ｎ强度随土壤含水量增加而增加，并在２５％时达到最大；５）甜菜吸收的总氮中，来自肥料Ｎ的比例在土壤含水量为２０％～２５％时为最大。
The soil pot experiments were carried out using ~ (15) N isotopes to study the relationship between soil water stress and N-uptake capacity and strength of sugar beet and the effect of N fertilizer efficiency. The results showed that: 1) the biological effect on sugar beet when soil moisture was about 20% Mainly N, and vice versa; 2) the minimum soil moisture that makes N fertilizer effective for sugar beet is 15%; 3) the proportion of sugar beet N absorbed in various organs is leaf: petiole: root is 10 : 2: 1; 4) The intensity of sugarbeet N absorption increases with soil water content and reaches the maximum at 25%; 5) The proportion of total nitrogen absorbed by sugar beet from fertilizer N is between 20% and 25% % Is the maximum.