Journal of Integrative Agriculture ›› 2015, Vol. 14 ›› Issue (12): 2434-2445.DOI: 10.1016/S2095-3119(15)61231-X

• 论文 • 上一篇    下一篇

Simulation of water and nitrogen dynamics as affected by drip fertigation strategies

 ZHANG Jian-jun, LI Jiu-sheng, ZHAO Bing-qiang, LI Yan-ting   

  1. 1、Institute of Agricultural Resource and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 10081, P.R.China
    2、State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, P.R.China
  • 收稿日期:2015-08-21 出版日期:2015-12-01 发布日期:2015-12-16
  • 通讯作者: LIJiu-sheng, Tel: +86-10-68786545, E-mail: lijs@iwhr.com;ZHAO Bing-qiang, Tel: +86-10-82108664, E- mail: zhaobingqiang@caas.cn
  • 作者简介:ZHANG Jian-jun, Mobile: +86-15801181005, Tel: +86-10-82108664, E-mail: zhangjianjun@caas.cn;
  • 基金资助:

    This work was financially supported by the Non-Profit National Research Institute, Ministry of Finance of China (IARRP-2012-202-3) and the Special Fund for Agro-scientific Research in the Public Interest, China (201203077-04-05).

Simulation of water and nitrogen dynamics as affected by drip fertigation strategies

 ZHANG Jian-jun, LI Jiu-sheng, ZHAO Bing-qiang, LI Yan-ting   

  1. 1、Institute of Agricultural Resource and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 10081, P.R.China
    2、State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, P.R.China
  • Received:2015-08-21 Online:2015-12-01 Published:2015-12-16
  • Contact: LIJiu-sheng, Tel: +86-10-68786545, E-mail: lijs@iwhr.com;ZHAO Bing-qiang, Tel: +86-10-82108664, E- mail: zhaobingqiang@caas.cn
  • About author:ZHANG Jian-jun, Mobile: +86-15801181005, Tel: +86-10-82108664, E-mail: zhangjianjun@caas.cn;
  • Supported by:

    This work was financially supported by the Non-Profit National Research Institute, Ministry of Finance of China (IARRP-2012-202-3) and the Special Fund for Agro-scientific Research in the Public Interest, China (201203077-04-05).

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摘要： The aim of drip fertigation is synchronising the application of water and nutrients with crop requirements, and maintaining the proper concentration and distribution of nutrient and water in the soil. The wetting patterns and nutrient distributions under drip fertigation have been proved to be closely related to the fertigation strategies. In order to find out the critical factors that affect the nutrient distribution under different drip fertigaiton strategies, a computer simulation model HYDRUS2D/3D was used to simulate the water and nitrate distribution for various fertigation strategies from a surface point source. Simulation results were compared with the observed ones from our previous studies. A 15° wedge-shaped plexiglass container was used in our experiment to represent one-twenty-fourth of the complete cylinder. The height of container is 40 cm, and the radius is 41 cm. The ammonium nitrate solution was added through a no. 7 needle connected to a Mariotte tube with a flexible hose. The soil water content, nitrate and ammonium concentrations were measured. The comparison of simulated and observed data demonstrated that the model performed reliably. The numerical analysis for various fertigation strategies from a surface point source showed that: (1) The total amount of irrigation water, the concentration of the fertilizer solution and the amount of pure water used to flush the pipeline after fertilizer solution application are the three critical factors influencing the distribution of water and fertilizer nitrogen in the soil. (2) The fresh water irrigation duration prior to fertigation has no obvious effect on nitrate distribution. The longer flushing time period after fertigation resulted in nitrate accumulation closer to the wetting front. From the point of avoiding the possibility of nitrate loss from the root zone, we recommended that the flushing time period should be as shorter as possible. (3) For a given amount of fertilizer, higher concentration of the fertilizer applied solution reduces the potential of nitrate leaching in drip irrigation system. While, lower concentration of the fertilizer solution resulted in an uniform distribution of nitrate band closer to the wetted front.

关键词: fertigation , strategy , drip irrigation , modelling , nitrate transport

Abstract: The aim of drip fertigation is synchronising the application of water and nutrients with crop requirements, and maintaining the proper concentration and distribution of nutrient and water in the soil. The wetting patterns and nutrient distributions under drip fertigation have been proved to be closely related to the fertigation strategies. In order to find out the critical factors that affect the nutrient distribution under different drip fertigaiton strategies, a computer simulation model HYDRUS2D/3D was used to simulate the water and nitrate distribution for various fertigation strategies from a surface point source. Simulation results were compared with the observed ones from our previous studies. A 15° wedge-shaped plexiglass container was used in our experiment to represent one-twenty-fourth of the complete cylinder. The height of container is 40 cm, and the radius is 41 cm. The ammonium nitrate solution was added through a no. 7 needle connected to a Mariotte tube with a flexible hose. The soil water content, nitrate and ammonium concentrations were measured. The comparison of simulated and observed data demonstrated that the model performed reliably. The numerical analysis for various fertigation strategies from a surface point source showed that: (1) The total amount of irrigation water, the concentration of the fertilizer solution and the amount of pure water used to flush the pipeline after fertilizer solution application are the three critical factors influencing the distribution of water and fertilizer nitrogen in the soil. (2) The fresh water irrigation duration prior to fertigation has no obvious effect on nitrate distribution. The longer flushing time period after fertigation resulted in nitrate accumulation closer to the wetting front. From the point of avoiding the possibility of nitrate loss from the root zone, we recommended that the flushing time period should be as shorter as possible. (3) For a given amount of fertilizer, higher concentration of the fertilizer applied solution reduces the potential of nitrate leaching in drip irrigation system. While, lower concentration of the fertilizer solution resulted in an uniform distribution of nitrate band closer to the wetted front.

Key words: fertigation , strategy , drip irrigation , modelling , nitrate transport