干旱地区农业研究2017，Vol.35Issue(3)：204-211,8.DOI:10.7606/j.issn.1000-7601.2017.03.32
不同盐度下施氮量对甜菜生长发育及氮素吸收利用特性的影响
Growth of sugar beet and its nitrogen uptake and utilization influenced by nitrogen level under different salinity
摘要
Abstract
In a pot experiment,sodium chloride was used to imitate three salinity level:mild(S1),medium (S2) and serious(S3) to investigate the effect of nitrogen fertilization on the growth and development,nitrogen uptake and utilization in sugar beet in salt environment.The main results were shown as follows:(1) Nitrogen application (0.3 ～ 2.4 g· kg-1) can significantly alleviate the damage caused by salt stress to sugar beet and enhance its ability to survive tmder salt stress.In mild(S1) and medium(S2) salt concentration,the optimum nitrogen application of sugar beet was 1.2 g· kg-1.In high (S3) salt concentration,the optimum nitrogen application was 0.6 g· kg-1.(2) The osmotic potential of sugar beet leaves decreased with nitrogen application increasing (0 ～ 2.4 g· kg-1) in three concentration of NaCl and osmotic adjustment ability showed an trend of increase.(3) Nitrogen application could promote the synthesis of photosyn thetic pigments in beet assimilation branches under different salinity,resulting in a high photosynthetic efficiency.(4) Both nitrogen productivity and agronomic nitrogen use efficiency showed a descending trend with nitrogen application increasing in three concentration of NaC1.They dropped dramatically when nitrogen application was 0.3 ～ 1.2 g· kg-1.Both nitrogen productivity and nitrogen agronomic efficiency ranked as S1 ～ S2 ～～ S3 in the same nitrogen level.(5) Nitrogen content in tuber,petiole and leaf of sugar beet increased with nitrogen application increasing (0 ～ 2.4 g· kg-1) in three concentration of NaC1.Nitrogen content generally appeared as leaf＞ petiole ＞ tuber in the same nitrogen level.(6) The upper limit of nitrogen application was 1.39,1.33 g· kg-1 and 1.24 g· kg-1 in the S1,S2 and S3 salinity,and for each of them,the highest yield of sugar beet of 90.09,72.86 g· pot-1 and 32.47 g· pot-1 respectively,was harvested.关键词
甜菜/盐胁迫/施氮量/氮素利用率/生长发育/渗透势Key words
sugar beet/salt stress/nitrogen fertilizer application level/nitrogen use efficiency/growth and development/osmotic potential分类
农业科技引用本文复制引用
魏显珍,赵斌,武晓燕,宋运涛..不同盐度下施氮量对甜菜生长发育及氮素吸收利用特性的影响[J].干旱地区农业研究,2017,35(3):204-211,8.基金项目
国家星火计划项目(2015GA184003) （2015GA184003）
