Đánh giá tiềm năng suy giảm độ phì nhiêu đất tỉnh An Giang

Abstract

The objective of the study was to assess the soil fertility degradation for the period of 2012-2016 and to show the changes in chemical properties in terms of spatial distribution and land use types. It also helped managers to propose effective measures to reduce and improve soil fertility degradation having been happening in the area. The study used a set of properties from background data to assess the degree and extent of soil fertility degradation on the basis of comparison with the soil samples analysis results at the same site or the same soils that are nearest to the location such as soil pH, organic matter (OM), cation exchange capacity (CEC), total nitrogen (N), total potassium (K), and total phosphorus (P). The result showed that the total area of the province had 112,321.38 hectares of soil with degraded fertility, occupied 40.21% of the surveyed area, and the land area without degraded fertility was 167,025 hectares, occupied 59.79% of surveyed area. In general, the soil fertility degradation in the province was light, but the soil chemical properties had significantly decreased in cultivated areas such as intensive rice cultivation in dike areas, short term crops growing areas, and forest soil in the low mountainous with have steep slope.