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Potential of biochar and organic amendments for reclamation of coastal acidic-salt affected soil

Biochar 2020年第1期2卷 107-120页

作者： Viraj Gunarathne Athula Senadeera Udaya Gunarathne Jayanta Kumar Biswas Yaser A.Almaroai Meththika Vithanage Ecosphere Resilience Research Centre Faculty of Applied SciencesUniversity of Sri JayewardenepuraNugegodaSri Lanka enviromicrobiology Ecotoxicology and Ecotechnology Research UnitDepartment of Ecological Studies and International Centre for Ecological EngineeringUniversity of KalyaniKalyaniNadia 741235West BengalIndia Department of Biology Faculty of Applied ScienceUmm Al-Qura UniversityMakkahSaudi Arabia Molecular Microbiology and Human Diseases National Institute of Fundamental StudiesKandySri Lanka

Salinity and acidity have affected several hundred million hectares of land throughout the globe which poses a major threat to global food security and *** of organic amendments for salt-affected soils has been identified as one of the most effective ways to mitigate salinity-induced problems and considered as a green technique offering twin benefits of waste load reduction and land ***,studies on reclaiming acidic-salt affected soils are ***,this study aimed to determine the reclamation potential of biochars and organic amendments involving Gliricidia sepium biochar produced at 300℃,500℃,and 700℃,green waste compost,and municipal sewage sludge at three different amend-ment ratios,1.0%,2.5%and 5.0%.The incubation experiment was conducted for a 4-month period with different amendment ratios applied to the coastal acidic-salt affected *** were extracted from incubation pots after 1 and 4 months and analyzed for soil chemical parameters(pH,EC,NO_(3)^(−),PO_(4)^(3−,total organic carbon,cation exchange capacity,sodium adsorption ratio,exchangeable sodium percentage)and microbial enzyme activity(catalase activity,and acid-and alkaline phosphatase activity).All organic amendments demonstrated enhancement of the soil properties in a significant ***,increasing incubation time and amendment ratio increase the changes of soil parameters by a great ***,the maximum amendment ratio of 5.0%and 4 months of incubation period rendered a significant improvement in the reclamation of acidic-salt affected ***,the biochar produced at 500℃ contributed the maximum towards the improved physicochemical and biochemical profile of acidic-salt affected soil,making it the most promising organic amend-ment for the reclamation of acidic-salt affected *** overall reclamation efficiency of organic amendments registered the following order of variation:700 BC

关键词： Salinity Soil acidity Compost Biosolids Soil amendment

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