Comparison of interpolated soil nutrients maps obtained with application of various approaches of ordinary kriging

Abstract

© 2020 IOP Conference Series: Earth and Environmental Science. All rights reserved. To create maps of the available forms of nutrients in arable land for implementation of systems of mineral fertilizers differential application, various approaches of interpolation by the ordinary kriging method were used. Maps of the availability were built according to the agrochemical analysis of mixed samples compiled from elementary plots of 5 ha. In the first case, the result of the agrochemical analysis was tied to the centroids of the elementary plots, and the interpolation was carried out using point ordinary kriging. In the second case, the indicator value was attached to blocks corresponding to the area of elementary sites. In this case, the interpolated cards were obtained using block kriging. It was shown that the application of various approaches to interpolation gives similar maps of spatial distribution. At the same time, maps obtained by ordinary point kriging are characterized by a more accurate forecast compared to maps obtained using block kriging. Therefore, the construction of interpolated maps of the availability of arable lands with nutrients based on the results of agrochemical analysis of mixed samples with data binding to the centroids of the sampling cells and compiling the combined samples is more preferable.