Sandy Soil Reclamation Using Biochar and Clay-Rich Soil
Diep Thi Pham 1  
,   Hang Nga Thi Nguyen 2  
,   Loc Van Nguyen 3  
,   On Viet Tran 2  
,   Anh Viet Nguyen 2  
,   Lan Phuong Thi Dinh 1  
,   Nguyen Van Vu 3  
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Institute for Water Resources Economics and Management, 131 Chua Boc, Dong Da, Ha Noi, Viet Nam
Thuyloi University, Vietnam, 175 Tay Son, Dong Da, Ha Noi, Viet Nam
Vietnam National University of Agriculture, Trau Quy, Gia Lam, Viet Nam
Diep Thi Pham   

Institute for Water Resources Economics and Management, 131 Chua Boc, Dong Da, Ha Noi, Viet Nam
Publication date: 2021-06-06
J. Ecol. Eng. 2021; 22(6):26–35
The investigations on the effects of biochar application in improving the physio-chemical properties of soil have been carried out in many studies; however, there are very few studies on the combined use of both biochar and clay-rich soil for poor nutrient soil reclamation. Therefore, this study demonstrates improved water retention and nutrient retention of sandy soil by using biochar and biochar combined with clay-rich soil. The experiments were conducted on a small scale (greenhouse) with nine different application rates of biochar and clay-rich soil were mixed and then cultivated peanut, along with the drip irrigation technique using field moisture limit (about 70-80%) was applied under the condition of ensuring a sufficient supply of NPK for plant’s growth. The results showed that at the rates from 10.0-15.0% (w/w) clay-rich soil mixed with from 0.5-1.5% (w/w) of biochar applied to the tested sandy soil resulted in the positive effects on soil water holding, bulk density, permeability, pH, CEC, OM, total N, total P and peanut yield. The physical and chemical characteristics of the tested sandy soil have been improved by time and the application rate of 10.0% clay-rich soil and 0.5% biochar had the highest efficiency of pod fresh weight and pod dry weight during three studied seasons.