Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 25, Issue 27, Pages 27583-27593Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-2823-3
Keywords
Rice; N fertilizer level; Surface runoff; N metabolism; Enzyme activity
Categories
Funding
- Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07203-005]
- Yangtze River Delta Technology Projects of Shanghai Municipal Science and Technology Commission [17295810602]
Ask authors/readers for more resources
Nitrogen (N), one of the most important nutrients for plants, also can be a pollutant in water environments. N metabolism is sensitive to N fertilization application and related to rice growth. Different levels of N fertilization treatment (N0, control without N fertilizer application; N100, chemical fertilizer of 100 kg N ha(-1); N200, chemical fertilizer of 200 kg N ha(-1); N300, chemical fertilizer of 300 kg N ha(-1)) were tested to investigate N loss due to surface runoff and to explore the possible involvement of rice N metabolism responses to different N levels. The results indicated that N loss through runoff and rice yield was simultaneously increased in response to increasing N fertilizer levels. About 30% of total nitrogen (TN) was lost in the form of ammonium (NH4 (+)) in a rice growing season, while only 3% was lost in the form of nitrate (NO3 (-)). Higher N application increased carbon (C) and N content and increased nitrate reductase (NR) and glutamine synthetase (GS) activities in rice leaves, while it decreased glutamate synthase (GOGAT) and glutamate dehydrogenase (GDH) activities. These results suggest that N caused the accumulation of assimilation products in flag leaves of rice and stimulated N metabolic processes, while some protective substances were also stimulated to resist low N stress. This study provides a theoretical basis for improving N fertilizer management to reduce N loss and increase rice yield.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available