Supplemental irrigation (SI) ensures an efficient conjunctive use of green and blue water resources in dryland cropping by alleviating the negative impacts of precipitation shortages and drought spells on plant growth and production. The management of SI at the field level is well documented but little is known about planning at basin scale. This work uses a geographic information system-based modelling approach together with suitability criteria to identify potential areas for expanding SI at scale. A spatial water allocation algorithm is developed to model SI water allocation using data layers consisting of climate surfaces, classified land-use maps, and a digital elevation model. Areas are prioritized stepwise, according to land suitability, until the available water is fully utilized.

中文翻译：

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农业中绿色和蓝色水资源的联合使用：补充灌溉的方法和应用*

补充灌溉 (SI) 通过减轻降水短缺和干旱期对植物生长和生产的负面影响，确保在旱地种植中有效地结合使用绿色和蓝色水资源。现场一级的 SI 管理有据可查，但对流域规模的规划知之甚少。这项工作使用基于地理信息系统的建模方法以及适用性标准来确定大规模扩展 SI 的潜在区域。开发了一种空间水分配算法，使用由气候表面、分类土地利用图和数字高程模型组成的数据层来模拟 SI 水分配。根据土地适宜性逐步确定区域的优先级，直到可用水得到充分利用。