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Content Provider | World Health Organization (WHO)-Global Index Medicus |
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Author | Hu, Kelin Li, Yong Chen, Weiping Chen, Deli Wei, Yongping Edis, Robert Li, Baoguo Huang, Yuanfang Zhang, Yuanpei |
Spatial Coverage | China |
Description | Author Affiliation: Hu K ( Department of Soil and Water Sciences, China Agricultural University, Beijing 100193, People's Republic of China.) |
Abstract | Understanding water and N transport through the soil profile is important for efficient irrigation and nutrient management to minimize nitrate leaching to the groundwater, and to promote agricultural sustainable development in desert oases. In this study, a process-based water and nitrogen management model (WNMM) was used to simulate soil water movement, nitrate transport, and crop growth (maize [Zea mays L.]) under desert oasis conditions in northwestern China. The model was calibrated and validated with a field experiment. The model simulation results showed that about 35% of total water input and 58% of the total N input were leached to <1.8 m depth under traditional management practice. Excessive irrigation and N fertilizer application, high nitrate concentration in the irrigation water, together with the sandy soil texture, resulted in large nitrate leaching. Nitrate leaching was significantly reduced under the improved management practice suggested by farm extension personnel; however, the water and nitrate inputs still far exceeded the crop requirements. More than 1700 scenarios combining various types of irrigation and fertilizer practices were simulated. Quantitative analysis was conducted to obtain the best management practices (BMPs) with simultaneous consideration of crop yield, water use efficiency, fertilizer N use efficiency, and nitrate leaching. The results indicated that the BMPs under the specific desert oasis conditions are to irrigate the maize with 600 mm of water in eight times with a single fertilizer application at a rate of 75 kg N ha(-1). |
File Format | HTM / HTML |
ISSN | 00472425 |
Issue Number | 2 |
Volume Number | 39 |
e-ISSN | 15372537 |
Journal | Journal of Environment Quality |
Language | English |
Publisher | American Society of Agronomy |
Publisher Date | 2010-03-01 |
Publisher Place | United States |
Access Restriction | Subscribed |
Subject Keyword | Discipline Environmental Health Agriculture Models, Chemical Nitrates Analysis Nitrogen Water Calibration China Desert Climate Water Movements Zea Mays Journal Article Research Support, Non-u.s. Gov't Validation Studies |
Content Type | Text |
Resource Type | Article |
Subject Domain (in MeSH) | Eukaryota Inorganic Chemicals Investigative Techniques Biological Phenomena Technology, Industry, and Agriculture Geographic Locations |
Subject | Management, Monitoring, Policy and Law Water Science and Technology Environmental Engineering Pollution Waste Management and Disposal |
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