Research on the restoration of soil fertility in degraded orange-growing areas of Nghe An province

Abstract

Quy Hop district (before the administrative merger), the largest orange-growing region in Nghe An province, is known for the “Cam Vinh” brand. Years of intensive cultivation and the indiscriminate use of chemical fertilizers and pesticides have negatively impacted soil fertility, leading to increased soil acidity, soil structure degradation, nutrient imbalance, reduced organic matter content, a decline in beneficial microorganisms, and an increase in harmful microorganisms in the root zone. This study evaluates the results of several measures to rehabilitate and restore soil fertility for the sustainable development of orange trees in the study area. The results showed that integrated management practices, including adjusting fertilizer types and rates and implementing moisture management, significantly improved soil physicochemical properties, reduced production costs, and increased economic efficiency in orange cultivation. Additionally, the application of bio-products increased the density of beneficial microorganisms in the rhizosphere, restored soil biological balance, and promoted the growth and development of orange trees.