Characterization of the soil compaction based on the mapping of the apparent electrical conductivity

Abstract

Based on the measurement of soil penetration resistance (PR), it is possible to identify compacted soil layers, where root growth may be harmed, affecting crop development and yield. The objective of this work was to analyze the use of management zones (MZ), delimited on the basis of mapping of the spatial variability of the soil apparent electrical conductivity (ECa), in the differentiation of soil compaction levels. The work was carried out in a 25.8-ha no-tillage area, cultivated under a center pivot. The ECa was measured under two soil moisture conditions (13.7 and 16.45%), using the Terram® equipment. Soil penetration resistance (PR) was measured using the SoloStar PLG5500 penetrograph. Based on the spatial variability ECa mapping, management zones (2, 3, and 4 zones) were delimited. The mean PR values ??of each MZ were compared by the t-test of means. It was possible to differentiate mean values ??of penetration resistance (PR), which vary from 0.9 to 2.10 MPa, from the characterization of management classes generated on the basis of the ECa spatial variability. The highest stratification of PR values ??was obtained as a function of sampling directed at delimited management zones when the soil had lower moisture content (13.7%). The highest mean PR values ??were obtained for the split of the ECa map into at least three classes. It was identified that for the study area there is no need to perform any mechanical decompaction operation.

Condutividade elétrica aparente do solo em áreas agrícolas brasileiras

“…), onde os autores verificaram altas correlações (> 0,7) entre a densidade do subsolo (abaixo de 0,3 m) e a CEa do solo mensurada pelo método indutivo em um Luvissolo Tsoulias et al (2020). contrapuseram algumas propriedades de plantas e solo, não encontrando qualquer relação da CEa com a densidade do solo, mas verificaram boas associações entre a CEa e a profundidade de raízes e composição granulométrica.Algaadi et al (2012) utilizaram a CEa, mensurada com um equipamento indutivo, para avaliar a compactação de um solo arenoso sob diferentes condições de umidade e níveis de compactação, obtendo boas correlações (> 0,65) em diferentes cenários com coeficientes tanto maiores quanto maior os teores de umidade do solo Bottega et al (2021). utilizaram a CEa para criar quatro regiões distintas em uma área de estudo, em cada região a compactação do solo foi mensurada em diversos pontos.…”