Qualidade física de latossolos amarelos da Chapada do Araripe sob diferentes manejos

Abstract

Little is known about physical attributes as indicators of soil quality related to different uses in Pernambuco State, more precisely in the semi-arid. PE, aiming to evaluate the effects of the use on productive aspects of the soil and its influence on the sustainability of these production systems in order to develop and apply a soil quality index to evaluate the impact of different uses and management on the soil. Four representative systems were selected: under preserved native vegetation; under degraded native vegetation, with low natural regeneration; under conventional use (cassava monoculture) and area under eucalyptus agroenergy use. For this, they were evaluated at depths of 0-10 cm and 10-20cm. To determine the soil quality index, the physical attributes and the soil organic carbon were first evaluated, and after the parameter averages were obtained, to obtain the soil quality index the 21 quality indicators found were: Physical indicators The most sensitive values for the quality evaluation of Chapada do Araripe Xanthic Ferralsol are the values obtained by the aggregate stability indexes, as well as the RT values, indicate a good soil aggregation state in the eucalyptus and cassava areas, justified by the values. TOC The values of the CCRAS and RP, together, prove the differences between the structural conditions of the studied areas, and the preserved area is considered the best structural condition in relation to the other areas. Ksat's results indicate that the degraded area is undergoing a process of recovering its structure. Analyzing the results of IQS, it is observed that the preserved area has the best results in the superficial and subsurface areas, this area also presents good results reinforcing what was discussed in this work. The IQS results at both depths show that the degraded area is undergoing a process of recovery of its physical characteristics.