Chemical fractionation of soil organic matter under different cropping systems

Abstract

The soil organic matter has a great importance for agriculture and is the result of the decomposition of plant and animal residues, root exudates, excrements and microorganisms, and is part of a natural cycle that is constantly changing. The humified fraction of organic matter makes the soil more fertile and contributes to the availability of nutrients to plants. This article aimed to evaluate the humic fractions (humic acids and fulvic acids) and total organic carbon of the soil under different cropping systems. The experiment was conducted at the Federal Institute Sertão Pernambucano, Campus Petrolina Rural Area, where three areas with different use systems were evaluated, of which were denominated: Vitis spp. (SPV), Pennisetum purpureum (SPC) and natural area of hyper xerophytic Caatinga (NAC). Soil samples were collected at a depth of 0-10 cm, for chemical fractionation and determination of total organic carbon. The NAC system provides more adequate conditions for SOM humification.

Keywords

• soil organic matter
• soil management
• humic substances