SOIL PLUS FOLIAR NITROGEN APPLICATION INCREASES COTTON GROWTH AND SALINITY TOLERANCE

文献类型： 外文期刊

第一作者： Luo, Zhen

作者： Luo, Zhen;Kong, Xiangqiang;Dai, Jianlong;Dong, Hezhong

作者机构：

关键词： cotton; foliar application; nitrogen fertilizer; soil application; salinity stress

期刊名称：JOURNAL OF PLANT NUTRITION （ 影响因子：1.707； 五年影响因子：1.645 ）

ISSN： 0190-4167

年卷期： 2015 年 38 卷 3 期

页码：

收录情况： SCI

摘要： Soil or foliar application of nitrogen (N) can increase plant growth and salinity tolerance in cotton, but a combination of both methods is seldom studied under salinity stress. A pot experiment was conducted to study the effects of soil application (S), foliar application (F), and a combination of both (S+F) with labeled nitrogen (N-15) on cotton growth, N uptake and translocation under salinity stress (ECe = 12.5 dS m(-1)). Plant biomass, leaf area, leaf chlorophyll (Chl) content, leaf net photosynthetic (Pn) rate, levels of N-15 and [Na+] and K+/ Na+ ratio in plant tissues were determined at 3, 7, 14 and 28days after N application (DAN). Results showed that soil or foliar nitrogen fertilization improved plant biomass, leaf area per plant and leaf photosynthesis, and a combination of soil- plus foliar-applied N was superior to either S or F alone under salinity stress. Although foliar application favored a rapid accumulation of leaf N and soil application a rapid accumulation of root N, S+F enhanced N accumulation in both leaf and root under salinity stress. The combined N application also maintained significantly greater [K+] and K+/Na+ than either soil or foliar application alone. Therefore, the improved plant growth and salinity tolerance under S+F relative to soil or foliar N application alone was attributed to the increased total uptake of N, balanced N concentrations in different tissues through enhanced uptake and accumulation in both leaves and roots, and higher ratio of K+/Na+.

分类号： S1

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