Modeling and correction of soil penetration resistance for variations in soil moisture and soil bulk density

Abstract

This study aimed to describe the behavior of models for adjusting data of soil penetration resistance for variations in soil moisture and soil bulk density. The study was carried out in Lucas do Rio Verde, MT, Brazil in a typic dystrophic red-yellow Latosol (Oxisol) containing 0.366 kg kg −1 of clay. Soil penetration resistance measurements were conducted in the soil moistures of 0.33 kg kg −1 , 0.28 kg kg −1 , 0.25 kg kg −1 and 0.22 kg kg −1 . Soil penetration resistance behavior due to variations in soil moisture and soil bulk density was assessed by estimating the soil resistance values by non-linear models. There was an increase of the soil penetration resistance values as soil was losing moisture. For the same edaphic condition studied, small differences in the data of soil bulk density affect differently the response of soil resistance as a function of moisture. Both soil bulk density and soil moisture are essential attributes to explain the variatio ns in soil penetration resistance in the field. The good representation of the critical soil bulk density curve as a limiting compression indicator requires the proper choice of the restrictive soil resistance value for each crop.KEY WORDS: soil compaction, pedotransfer functions, cone index. MODELAGEM E CORREÇÃO DA RESISTÊNCIA DO SOLO À PENETRAÇÃO PARA VARIAÇÕES NA UMIDADE E DENSIDADE DO SOLORESUMO: O presente trabalho buscou descrever o comportamento de modelos para ajustes dos dados de resistência do solo à penetração para variações na umidade e na densidade do solo. O trabalho foi realizado no município de Lucas do Rio Verde-MT, em Latossolo Vermelho-Amarelo distrófico típico contendo 0,366 kg kg -1 argila. As determinações da resistência do solo à penetração ocorreram nas umidades de solo de 0,33 kg kg -1 , 0,28 kg kg -1 , 0,25 kg kg -1 , 0,22 kg kg -1 . O comportamento da resistência do solo à penetração, em função de variações na umidade e densidade do solo, foi avaliado pela estimativa nos valores de resistência do solo por modelos não lineares. Houve aumento dos valores de resistência do solo à penetração, à medida que o solo foi perdendo umidade. Para uma mesma condição edáfica estudada, pequenas variações nos dados de densidade do solo afetam diferentemente a resposta da resistência do solo em função da umidade. A densidade do solo é atributo imprescindível para explicar as variações na resistência do solo à penetração em campo, tanto quando a umidade do solo. A boa representação da curva de densidade crítica do solo como indicador de compactação limitante requer a escolha adequada do valor de resistência do solo restritivo para cada cultura. PALAVRAS -CHAVE:compactação do solo, funções de pedotransferência, índice de cone.

Resistance of a Red Latosol to Penetration: Comparison of Penetrometers, Model Adjustment, and Soil Water Content Correction

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