DEPENDÊNCIA ESPACIAL DAS PROPRIEDADES FÍSICAS DO SOLO E MASSA SECA DE PASTAGEM SOB MANEJO INTENSIFICADO

Abstract

There are several technologies that enable the applicability of precision agriculture; however, regarding soil physics, it is necessary to understand the spatial and temporal variability of soil and plant constituents and their relationships, considering the possibility of managing this variability. We understand that soil is a limited resource since restoring its essential components requires extended periods to return to its initial state, making it crucial to estimate the degree of anthropogenic actions caused by improper management of agricultural activities. The general objective of this study was to assess the spatial variability of soil physical attributes and dry mass in a pasture system under intensified management. The experimental area is located in the municipality of Divinópolis de Goiás, situated in the Northeast region of the state of Goiás. The farm has approximately 41.57 hectares of cultivated pastures and six established paddocks. In the AutoCad® software, a sampling grid of 60m x 60m was created, totaling 112 points. At each point, the altimetry was measured using GPS, a sample of Andropogon grass (Andropogon gayanus, Kunth.) was collected, deformed soil samples were taken from the A1 layer (0.00- 0.20 m), and undisturbed soil samples were collected from two layers: P1 (0.00-0.10 m) and P2 (0.10-0.20 m). The average altimetry value of the property was 708.88 m. The moisture content was below 10% at both studied depths, P1 and P2. The contour maps, created using adjustments obtained from the semivariograms, allow for the display and quantification of soil variability, thus enabling variable-rate input applications, reducing costs, and minimizing environmental impact.