Effects of Nitrogen Amount on the Photosynthesis Parameters of Summer Millet in North China

• Published in: Agricultural biotechnology (Pawtucket, R.I.) Vol. 7; no. 3; pp. 19 - 23
• Main Authors: Zhao, Qing, Zhao, Guoshun, Yang, Mengya, Chen, Susheng, Xiao, Kai
• Format: Journal Article
• Language: English
• Published: Cranston Wu Chu (USA-China) Science and Culture Media Corporation 01.06.2018
• Subjects: Agricultural production; Biological activity; Biomass; Carbon; Carboxylation; Cereal crops; Cereals; Corn; Crop yield; Crops; Cultivars; Efficiency; Electron transport; Experiments; Grain; Growth stage; Leaf area; Leaves; Light intensity; Luminous intensity; Millet; Nitrogen; Nutrients; Parameters; Photosynthesis; Plant biomass; Planting density; Productivity; Rice; Seeds; Senescence; Summer; Wheat; China
• ISSN: 2164-4993

[...]as one of the mdispensihle inorganic nutrients, nitrogen ( N) input level plays a critical role in regulating the photosynthesis behaviors in cereal crops '1 , and modulates drastically the plant biomass and the crop yield potential1131, To date, although the effects of N input level cm photosynthesis behaviors are largely known in various major cereal crops, such as wheat, maize, and rice ⅛' · , and the photosynthesis parameters of leaves under N input treatments are remained to be characterized in millet. In cereals, over 90 percentage of the plant biomass derives from the photosynthetic assimilates, which control the plant yield behavior ls] . [...]at late growth stage of cereals, grain filling is the central biological process. Similar to other external factors, such as light intensity, plant density, temperature and CO conditions that affects drastically the physiological processes of plants due to their roles in regulating the carboxylation efficiency and electron transport capacity in photosynthesis 19-20 , nitrogen supply level acts as a critical factor in the regulation of leaf area expansion'211, photosynthesis efficiency, and leaf senescence 0 ^ " !, Ь this study, the Pn, Chi, PAD and CSD in the upper leaves of millet cultivare indicate to be upregulated by increased N input level. Along with the increase of the N input amount, Pn and Chi were gradually elevated and PAD and RSP extended in the tested leaves, which contributed to the improved plant yield under the high N input treatment (i. e. , N 150 kg/ha). [...]suitable N application is an effective technique in improving the production of summer millet in Hebei plain.