Atributos químicos e fracionamento físico da matéria orgânica do solo sob diferentes sistemas de manejo

Abstract

Brazil has been standing out globally due to the growth of agricultural exports, driven by technological advancements resulting from research investments. These advancements require detailed analyses of soil quality, considering chemical, physical, and biological attributes, which aid in more efficient management, increasing agricultural productivity and diversification. This study aims to evaluate and compare soil chemical attributes and different fractions of organic matter on a farm employing four different management practices: preserved forest area, native field pasture area, reformed pasture area, and crop-livestock integration area. Conducted at Lagoa Bonita Farm, in Coronel Domingos Soares (PR), soil samples were collected at two depths (0-10 cm and 10-20 cm). Elements (P, K, Ca, Mg, Al), pH, base and aluminum saturation, as well as total organic carbon (TOC), particulate organic carbon (POC), and mineral-associated organic carbon (MAOC) were analyzed. Data underwent statistical analysis using Tukey’s test (P < 0.05) to verify significant differences between treatments. Results indicated that P, K, Ca, and Mg were higher in reformed pasture and crop-livestock integration areas, while Al and m% prevailed in the preserved forest. Vand pH were higher in cultivated areas, reflecting continuous corrections. TOC, POC, and MAOC did not differ at 0-10 cm depth but showed significant variations at 10-20 cm depth, with TOC and MAOC being higher in the forest and POC in native pasture. It is concluded that management practices impact soil fertility and structure, being more expressive in cultivated areas.