Properties of biochars produced from diverse agricultural organic residues in their behavior in Thai soils

Name: Tanawan Limwikran

LCSH: Kasetsart University -- Dissertations. Ph.D. (Soil Science) 2018

Classification :.LCCS: S599.6.T35

LCSH: Kasetsart University. -- Department of Soil Science -- Dissertations

LCSH: Soils -- Thailand

LCSH: Soil conditioners

LCSH: Biochar

LCSH: Organic farming -- Thailand

LCSH: Biomass

Abstract: Many biochars contain considerable amounts of plant nutrients. This research aimed at (1) studying the properties of biochars produced from diverse agricultural organic residues, (2) determining if biochars can improve properties of highly developed, highly weathered and highly leached Thai soils. Nine biochars from different agricultural waste (bamboo wood, eucalyptus wood, mangosteen shell, durian shell, pineapple peel, corncob, rice husk, coconut shell and palm kernel shell) and ten soils sampling from the top soil (0-20 cm) were investigated in an experiment. A 100 g soil sample was placed in the container with 1 g of biochar, sandwiched between two sheets of 1 mm nylon mesh and two equal layers of soil. The treatments were replicated four times (1, 2, 4 and 8 weeks incubation). After incubation, the soil and biochar were separated and dried at room temperature. The biochar was recovered for analysis (chemical and SEM-EDS) and the soil chemical properties were measured. Results show that much potassium in biochar is soluble in water and this rapidly diffused into the soil together with some of the K present in poorly soluble compounds in biochar. Calcium in biochar was mostly conserved within grains and considerable soil calcium was adsorbed by biochar due to exchange of calcium from soil by potassium released from biochar. Some of the phosphorus in biochar dissolved and diffused into the soil where it increased levels of available phosphorus. Some biochars adsorbed minor amounts of potassium and phosphorus from the soil. The pH and EC values of soils increased during the first week of incubation that get a component of soluble salts from biochar. These various behaviors can be explained on the basis of the crystalline compounds present in biochars and their location within the micro-porous fabric of biochar. Soil properties cannot be used to predict the movement of elements from and into biochar grains. These biochars offer numerous benefits when applied to soils because they increase plant nutrients and carbon sequestration. This study provides useful information about short-term effects of biochar application on soil. It is clear that biochar has potential as a soil amendment and will increase long-term carbon sequestration in soil.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Irb Kheoruenromne

Role: Thesis Advisor

Name: Anchalee Suddhiprakarn

Role: Thesis CO-Advisor

Name: Gilkes, Robert J

Role: Thesis CO-Advisor

Name: Nattaporn Prakongkep

Role: Thesis CO-Advisor

Created: 2018

Modified: 2025-06-29

Issued: 2025-06-29

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2561/tanawan-lim-all.pdf

CallNumber: S599.6.T35 .T36

eng

Spatial: Thailand

Spatial: Thailand

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Soil Science

Grantor: Kasetsart University

©copyrights Kasetsart University

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