Spatial variability of soil properties and its influence on maize yield formation in precision farming systems of the Ukrainian Polissia
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Abstract
Spatial heterogeneity of soil properties is one of the key factors determining crop productivity and the efficiency of resource use in modern agricultural systems. This issue is particularly relevant for the Polissia region, where soils are characterized by significant variability in agrophysical and physico-mechanical fertility indicators (structure, soil hardness & compaction), organic matter content, acidity (pH levels), and nutrient availability. Conventional uniform management practices often fail to account for this variability, resulting in inefficient fertilizer use and reduced economic returns. The aim of this study was to determine the patterns of grain maize (Zea mays L.) productivity formation under conditions of spatial soil heterogeneity within a precision farming system. The research was conducted under the implementation of precision farming technologies at a high-tech agricultural enterprise located within the Vysokivska rural territorial hromada of the Zhytomyr district, Zhytomyr region. The spatial variability of soil cover properties and maize yields was assessed by integrating yield map data obtained from combine harvester monitoring systems, soil agrochemical analysis results, and satellite-based vegetation indices characterizing crop development dynamics throughout the growing season. Spatial data processing and visualization were performed using digital farm management platforms, specifically Cropwise Operations Center and John Deere Operations Center, which facilitate the accumulation, analysis, and integration of agronomic and geospatial data within a precision agriculture framework. Geostatistical and GIS-based methods were employed to delineate management zones and evaluate the interrelationships between soil parameters and maize productivity. All target plots are situated within the Haplic Albeluvisols (Light Grey Forest Soils) soil association, with minor inclusions of Haplic Phaeozems (Dark grey forest soils) and Haplic Chernozems, which is characteristic of this particular sub-region of the Ukrainian Polissia. Geostatistical and GIS-based methods were used to identify management zones and assess relationships between soil parameters and maize productivity. The results demonstrated significant spatial variability of yield within the field, which was strongly associated with differences in soil fertility indicators, particularly humus content, soil acidity, and nutrient availability. The findings confirm the importance of site-specific management practices in conditions of heterogeneous soil cover. Implementation of precision agriculture tools enables optimization of fertilizer application and improved resource use efficiency, thereby enhancing the sustainability and economic performance of maize production systems in the Polissia region.
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