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Hình thái và tính chất lý, hóa học đất phèn vùng Đồng Tháp Mười

2017; Volume: Môi trường 2017; Linguagem: Inglês

10.22144/ctu.jsi.2017.047

2815-5599

Trần Văn Hùng, Lê Phước Toàn, Trần Văn Dũng, Ngô Ngọc Hưng,

Mine drainage and remediation techniques

In order to suitably use acid sulfate soils, it is necessary to survey and determine the genesis, distribution, classification and physio-chemical properties of acid sulfate soils. The research was aimed at describing soil morphology profiles and surveying soil physical and chemical characteristics in some types of acid sulfate soils in Dong Thap Muoi region. Soil samples at the original horizons were taken to determine physical and chemical properties. The soils in Thanh Hoa – Long An province were classified as heavily actual acid sulfate soil (Epi-Orthi-Thionic Fluvisols), which contained the jarosite mottles (2.5Y8/6) below 50 cm depth and sulfidic materials appeared > 75 cm depth. In Tan Thanh – Long An province and Tan Lap – Tien Giang province, the soils were classified as lightly actual acid sulfate soil (Endo-Orthi-Thionic Gleysols and Fluvisols), of which the jarosite mottles (2.5Y8/6) occurred >50 cm depth and sulfidic materials presented > 80 cm depth. The areas in Tan Thanh were surrounded by flood preventing dykes and mainly grown with 3 rice crops all year round. Both areas in Ben Ke and Tan Lap were cultivated with vegetables (Dioscorea alata and pineapple). The pH values within the topsoil layers in all acid sulfate soil profiles in Dong Thap Muoi were low, varying in a range from 2.9 to 4.2. The soils also had medium to high risks of Al, Fe toxicity and low contents of exchangeable cations Na+, K+, Ca2+, and Mg2+. During cultivation, these soils should be applied with organic fertilizers or alkaline fertilizers to neutralize, reduce acidity, and increase soil fertility.