大型喷灌机变量灌溉技术研究进展

    Review on variable rate irrigation with continuously moving sprinkler machines

    • 摘要: 变量灌溉具有借助变量灌水方法、定位方法和控制系统在田块内改变灌水深度,应对特定的土壤、作物和其他条件的能力,是解决大型喷灌机较大单机控制面积内土壤、作物空间变异问题,提高灌溉水利用效率,充分挖掘整个田块作物生产潜力的水分管理方法。由于变量灌溉技术研究起步较晚,中国的研究刚处于起步阶段,尚缺乏成熟的变量灌溉管理理论与技术。该文在系统总结国内外研究成果的基础上,从变量灌溉内涵、大型喷灌机变量灌溉系统构建、变量灌溉管理分区、决策支持系统以及变量灌溉效益5个方面分析了大型喷灌机变量灌溉技术研究进展。结果表明,目前关于大型喷灌机变量灌溉系统组成方法的理论研究相对比较成熟,其主要由变量供水装置、定位系统、控制系统三部分组成,大型喷灌机变量灌溉系统软硬件开发尚存在较大的发展空间。基于作物生长指标的变量灌溉动态处方图、将变量灌溉技术与非充分灌溉原理相结合的水分管理决策方法,以及利用变量灌溉施肥系统进行喷灌水肥一体化研究,代表着集约化农田大型喷灌机水肥精准管理的重要发展方向。该文可为提高大型喷灌机水分管理水平,实现精准灌溉提供参考。

       

      Abstract: With the scale, intensive and modern development of China??s agriculture, it supplies the opportunity for the utilization of continuously moving sprinkler systems. In the large area covered by individually continuously moving sprinkler machine, the spatial variability of crop yield is inevitably caused by soil and crop performance variability. Variable rate irrigation (VRI) has the capability of applying spatially varied water depths to address specific soil, crop, and/or other conditions across the entire field. It has been recognized as an efficient water management practice to enhance water potential productivity for continuously moving sprinkler machines. However, for this emerging irrigation technology, especially in China, we have quite limited knowledge on optional management of VRI systems due to substantially short research history. The advances in VRI research, including the connotation, architecture and construction, identification of management zones, decision support system and economic benefits for VRI system with continuously moving sprinkler machines, are thoroughly reviewed in this article. Moreover, the future research topics are suggested aiming at accelerating the research and application of VRI technology and improving water management for continuously moving sprinkler systems. The study indicates that the theory about the architecture and construction of VRI systems is relatively mature, and it consists of various methods to vary water application depths, a method of position determination, and a microprocessor-based device to control water application amounts from each sprinkler head or groups of sprinkler heads based on location and other management criteria. Besides, the test standard of hydraulic performance for VRI system needs to be further studied. The static delineation of management zones and prescription maps based on soil characteristics is the main water management method for VRI systems, and the dynamic water management based on the continuous monitoring and assessment of climatological and crop data stands for the future of VRI systems. With the development of research about the effects of soil texture on crop potential yield, water use efficiency and crop canopy temperature, the feasibility assessment on static water management and the integrated development of dynamic water management need to be further studied. The decision support system should be developed individually according to the precipitation amount, and the maximum water use efficiency and crop yield should be set as the main objective under dry weather and humid climate conditions, respectively.

       

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