Journal of Agricultural Science and Technology
Journal of Agricultural Science and Technology
JAST
Agriculture
http://jast.modares.ac.ir
1
admin
1680-7073
2345-3737
10.22034/jast
en
jalali
1393
12
1
gregorian
2015
3
1
17
2
online
1
fulltext
en
Effects of Nitrogen Application on Soil Nitrification and Denitrification Rates and N2O Emissions in Greenhouse
Nitrous oxide (N<sub>2</sub>O) has significant impact on global warming and leads to the depletion of ozone in the stratosphere. Agricultural soil is regarded as a major source of N<sub>2</sub>O emissions. In recent years, greenhouse grown vegetables have rapidly developed in China. Although excessive fertilizer application in greenhouse vegetable production can result in increased N<sub>2</sub>O emissions, research data on such emissions from greenhouse vegetables, such as cucumber, remains limited. In this study, four nitrogen (N) fertilizer treatments including 1,200 (N<sub>1200</sub>, traditional N amount), 900 (N<sub>900</sub>), and 600 kg N ha<sup>-1</sup> (N<sub>600</sub>) and the control (N<sub>0</sub>) were carried out on cucumber in a greenhouse in the North China Plain. Results showed that N<sub>2</sub>O emissions mainly occurred in the first five days after topdressing, and accounted for 75.8%-95.2% of total N<sub>2</sub>O emissions produced in the whole interval (10 days). Significant exponential correlations were observed between N<sub>2</sub>O flux and nitrification or denitrification rates (<em>P</em>< 0.01). The results also indicated that nitrification dominated and played a more important role in N<sub>2</sub>O emissions than denitrification under the irrigation conditions of the study (water-filled pore spacewas 40.0 to 66.6%). Cumulative N<sub>2</sub>O emissions were 0.48-5.01 kg N ha<sup>-1</sup> in the cucumber growing season, accounting for 0.28-0.38% of nitrogen input. Compared to N<sub>1200</sub>, treatment N<sub>600</sub> significantly reduced the rate of N<sub>2</sub>O emissions by 53.4%, and also maintained cucumber yield. Based on this study, 50% of the traditional N fertilizer rate (N<sub>600</sub>) was considered sustainable for greenhouse cucumber production in the North China Plain.
Cucumber,Environmental factor,Nitrogen fertilizer,N2O flux. Soil NO3-N
519
530
http://jast.modares.ac.ir/browse.php?a_code=A-23-1000-3162&slc_lang=en&sid=23
Y. K.
Li
Y. K.
Li
100319475328460055880
100319475328460055880
Yes
Beijing Research Center of Intelligent Equipment for Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, People’s Republic of China.
Beijing Research Center of Intelligent Equipment for Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, People’s Republic of China.
B.
Li
B.
Li
100319475328460055879
100319475328460055879
No
Beijing Research Center of Intelligent Equipment for Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, People’s Republic of China.
Beijing Research Center of Intelligent Equipment for Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, People’s Republic of China.
W. Z.
Guo
W. Z.
Guo
100319475328460055878
100319475328460055878
No
Beijing Research Center of Intelligent Equipment for Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, People’s Republic of China.
Beijing Research Center of Intelligent Equipment for Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, People’s Republic of China.
X. P.
Wu
X. P.
Wu
100319475328460055877
100319475328460055877
No
Institute of Agricultural Resource and Regional Planning, Chinese Academy of Agriculture Sciences, Beijing 100081, People’s Republic of China.
Institute of Agricultural Resource and Regional Planning, Chinese Academy of Agriculture Sciences, Beijing 100081, People’s Republic of China.