Evaluation of spatial variability of physico-chemical indicators of chernozem podzolic with the using of precise agriculture technologies

Abstract

On the experimental fields of “Lotivka Elite” LLC of Shepetivka district of Khmelnytsky region the estimation of spatial heterogeneity of indicators of physical and chemical properties of chernozem podzolic was carried out. Statistical analysis of the data was performed on the following indicators: number of observations (n); average value (Xav); standard deviation (S); coefficient of variation (Cv); absolute error of the mean (SXav). The analysis of the probability of the nature of the humus content was performed according to the humus content index - the ratio of the actual humus content at the control point to the arithmetic mean. It is revealed that the probability of manifestation of average (typical) values of humus content at the studied object does not exceed 50%, deviations of probabilities from the average level of humus content in the direction of decrease do not exceed 40% of territorial distribution. Spatial variability of humus and mobile calcium content is average, CV is 19–23% (10 more CV less than 25). Statistical parameter of calcium content in the soil layer 0-30 cm on average - 252.4 ± 10.0, maximum - 350.0 ± 9.11 mg on 100 g of soil. In general, the field is dominated by soils with a content of mobile calcium 240.0-290.0 mg on 100 g of soil. Active acidity was characterized by low variability, the average was 6.5 ± 0.3, the maximum - 7.3 ± 0.2 pH units. The yield of winter wheat had a low degree of variability with an average of 87.4 ± 4.3 c on ha.