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Research Project: Genetic Improvement of Crop Plants for Use with Low Quality Irrigation Waters: Physiological, Biochemical and Molecular Approaches

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Title: Continuous nitrogen application effects on seed yield, yield components and nitrogen use efficiency of Leymus chinensis in two different saline-sodic soils of Northeast China

Author
item HUANG, LIHUA - Chinese Academy Of Sciences
item LIANG, ZHENGWEI - Chinese Academy Of Sciences
item Suarez, Donald
item WANG, ZHICHUN - Chinese Academy Of Sciences
item LIU, MIAO - Chinese Academy Of Sciences
item WANG, MINGMING - Chinese Academy Of Sciences
item YU, YINGJIE - Chinese Academy Of Sciences

Submitted to: Crop and Pasture Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/25/2019
Publication Date: N/A
Citation: N/A

Interpretive Summary: The grasslands of the western Songnen Plain of Northeast China are mostly classified as saline or saline sodic and are currently low in productivity. As these lands are N deficient, they respond positively to N application. To further clarify the impact of nitrogen application on Leymus chinensis, seed yield and related parameters were monitored in a field experiment with two saline-sodic soils at the Da'an Sodic Land Experiment Station (DASLES) from 2010 to 2011. One field was classified as moderate saline–sodic grassland (MSSL) and the other severe saline–sodic grassland (SSSL). Nitrogen application rates were 0 (no fertilizer as control), 30, 60, 90, 120, 150, 180, and 210 kg N ha–1. Nitrogen application significantly improved seed yield mainly through increased spike number and heading percentage of Leymus chinensis. The seed yield of Leymus chinensis was increased 7.4 to 10.9 times with nitrogen application rate of 150 kg ha-1 as compared to no nitrogen application in MSSL, and 5.3 to 7.5 times with nitrogen application rate of 120 kg ha-1 as compared to those with no nitrogen application in SSSL. There are some significant differences in seed yield between 2010 and 2011 and between MSSL and SSSL under the same nitrogen addition rates. Nitrogen application also significantly impacted various nitrogen efficiencies of Leymus chinensis in the two saline-sodic soils. Correlation analysis demonstrated that seed yield and nitrogen efficiencies are not the best parameters to determine the optimum nitrogen application. Nitrogen application was a most practical and effective method to increase seed yield of Leymus chinensis in moderate saline-sodic grasslands, but not in severe saline sodic grassland where the limiting factor appeared to be elevated pH. This information is of direct use to land management specialists attempting to increase grassland productivity while minimizing cost and adverse environmental impacts of excess N application.

Technical Abstract: Nitrogen application significantly influences the growth and hay yield of Leymus chinensis (Trin.) Tzvel. in the western Songnen Plain of Northeast China. To further clarify the impact of nitrogen application on seed yields and yield components, Leymus chinensis’s seeds and related parameters were monitored in a field experiment with two saline-sodic soils at the Da'an Sodic Land Experiment Station (DASLES) from 2010 to 2011. Both fields were classified as moderate saline–sodic grassland (MSSL) and severe saline–sodic grassland (SSSL), respectively. Nitrogen application rates were 0 (no fertilizer as control), 30, 60, 90, 120, 150, 180, and 210 kg N ha–1. Nitrogen application significantly improved seed yield mainly through increased spike number and heading percentage of Leymus chinensis. The seed yield of Leymus chinensis was increased 7.4 to 10.9 times with nitrogen application rate of 150 kg ha-1 as compared to no nitrogen application in MSSL, and 5.3 to 7.5 times with nitrogen application rate of 120 kg ha-1 as compared to those with no nitrogen application in SSSL. There are some significant differences in seed yield between 2010 and 2011 and between MSSL and SSSL under the same nitrogen addition rates. Nitrogen application also significantly impacted various nitrogen efficiencies of Leymus chinensis in the two saline-sodic soils. Correlation analysis demonstrated that seed yield and nitrogen efficiencies are not the best parameters to determine the optimum of nitrogen application. Nitrogen application was a most practical and effective method to increase seed yield of Leymus chinensis in saline-sodic grasslands.