Abstract:
Site Specific Management Zones (SSMZ) is a key link in precision agriculture to realize the timing, fixed point, quantitative, and fixed formula input of water and fertilizers and other agricultural production materials. SSMZ has been rapidly developed and applied in precision agriculture. It is of great significance in reducing agricultural input, improving economic efficiency and reducing agricultural non-point source pollution. A comprehensive understanding the research status and existing problems of SSMZ will help to better grasp the development trend of SSMZ and its application in the further research. This paper sorted out the application principles, data types, advantages and limitations of different input quantities in SSMZ at home and abroad, summarized the existing partitioning methods, and sorted the SSMZ evaluation methods commonly used. Different evaluation methods were analyzed, summarized and prospected. The input of SSMZ changed from mapping the spatial attributes of soil based on spatial interpolation to the use of remote sensing technology to obtain relevant information such as soil and vegetation. With the arrival of the era of big data, the comprehensive consideration of historical soil physical and chemical properties, effects of soil-forming elements, crop spatiotemporal dynamics, and hydrogeological topography and landforms helped to improve the accuracy of SSMZ. The researches based on the dense data obtained by near-end sensors and drones were increasing, and the accuracy of field-scale spatial information was high and its continuity was enhanced. Traditional unsupervised classification algorithms were gradually replaced by object-oriented segmentation methods, and the partition results were more helpful to guide field management measures. Evaluation information used for SSMZ was main by the soil properties closely related to crop growth or the crop growth parameters. Attention to SSMZ had been gradually increasing at home and abroad, and various SSMZ research results had important practical significance for realizing green agriculture and maintaining ecological security.