Use of mixed solid waste as a soil amendment for saline-sodic soil remediation and oat seedling growth improvement.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016;
23:21407-21415. [PMID:
27502567 DOI:
10.1007/s11356-016-7360-3]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 08/01/2016] [Indexed: 06/06/2023]
Abstract
Soil salinization has become a worldwide problem that imposes restrictions on crop production and food quality. This study utilizes a soil column experiment to address the potential of using mixed solid waste (vinegar residue, fly ash, and sewage sludge) as soil amendment to ameliorate saline-sodic soil and enhance crop growth. Mixed solid waste with vinegar residue content ranging from 60-90 %, sewage sludge of 8.7-30 %, and fly ash of 1.3-10 % was added to saline-sodic soil (electrical conductivity (EC1:5) = 1.83 dS m-1, sodium adsorption ratio (SAR1:5) = 129.3 (mmolc L-1)1/2, pH = 9.73) at rates of 0 (control), 130, 260, and 650 kg ha-1. Results showed that the application of waste amendment significantly reduced SAR, while increasing soil soluble K+, Ca2+, and Mg2+, at a dose of 650 kg ha-1. The wet stability of macro-aggregates (>1 mm) was improved 90.7-133.7 % when the application rate of amendment was greater than 260 kg ha-1. The application of this amendment significantly reduced soil pH. Germination rates and plant heights of oats were improved with the increasing rate of application. There was a positive correlation between the percentage of vinegar residue and the K/Na ratio in the soil solutions and roots. These findings suggest that applying a mixed waste amendment (vinegar residue, fly ash, and sewage sludge) could be a cost-effective method for the reclamation of saline-sodic soil and the improvement of the growth of salt-tolerant plants.
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