BIOCHAR AMENDMENT TO IMPROVE SOIL PRODUCTIVITY WITH PARTICULAR EMPHASIS ON THE INFLUENCE OF SOIL TYPE

Peake, Lewis (2015) BIOCHAR AMENDMENT TO IMPROVE SOIL PRODUCTIVITY WITH PARTICULAR EMPHASIS ON THE INFLUENCE OF SOIL TYPE. Doctoral thesis, University of East Anglia.

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Abstract

Three experiments were conducted to explore the effects of gasified biochar on contrasting temperate soil types in East Anglia, an agricultural area in eastern England, with a focus on the influence of soil properties.
In a laboratory experiment comparing eight dissimilar soil types, adding up to 2.5% biochar improved field capacity by up to 42% (15% on average) and available water capacity by up to 48% (22% on average), but silty soils were less responsive. BD was reduced by up to 19% (10% on average).
In a three-season outdoor pot trial with spring wheat (Triticum aestivum), four soil types were treated with biochar (at 0%, 0.1%, 0.5% & 2.5%). Biochar affected crop yield and soil properties, mainly positively, especially pH, CEC, base cations, field capacity, saturated hydraulic conductivity and some micronutrients. Positive yield responses appeared to be predominantly due to the influence of biochar on soil hydrology, increasing water-holding capacity on sandy soils in dry weather, while improving infiltration during excessively wet weather on a silty clay loam.
In a trial on three contrasting soils in one field, cropped with winter barley (Hordeum vulgare), biochar (at 0, 50 t ha–1 & 100 t ha–1) had a range of predominantly positive effects. There were no significant increases in crop yield in this well managed agroecosystem, but variables which responded significantly included pH, some nutrients in the soil and in the crop, and grain moisture content. There was also evidence that biochar improved grain quality by reducing grain protein content on sandy soils, and increasing it on loam, keeping it within the tolerable limits of the malting barley industry in both cases. Potentially toxic elements (PTEs) within the barley grain (Zn, Cu, As, Ni, Cd and Cr) were not raised to levels critical to food safety.
The overarching conclusion is that soil type, as defined by its physical, chemical and biological characteristics, is highly influential with respect to a range of effects that BC has on soil properties and crop responses, and that such characteristics need not only to be factored into future BC research, but should be the focus of studies aimed at identifying critical threshold values.

Item Type: Thesis (Doctoral)
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: Mia Reeves
Date Deposited: 01 Jul 2015 10:57
Last Modified: 01 Jul 2015 10:57
URI: https://ueaeprints.uea.ac.uk/id/eprint/53459
DOI:

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