1. Soil Plus Foliar Nitrogen Application increases Cotton Growth and Salinity Tolerance
- Author
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Hezhong Dong, Jianlong Dai, Zhen Luo, and Xiangqiang Kong
- Subjects
Plant growth ,Physiology ,fungi ,food and beverages ,chemistry.chemical_element ,Biomass ,Photosynthesis ,Nitrogen ,Salinity stress ,Salinity ,chemistry.chemical_compound ,Nitrogen fertilizer ,chemistry ,Agronomy ,Chlorophyll ,Agronomy and Crop Science - Abstract
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 (15N) 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 15N and [Na+] and K+/ Na+ ratio in plant tissues were determined at 3, 7, 14 and 28 days 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 accu...
- Published
- 2015