Use of biochar on two volcanic soils: effects on soil properties and barley yield
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Date
2014
Authors
Curaqueo, G.
Meier, S.
Khan, N.
Cea, M.
Navia, R.
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Journal of Soil Science and Plant Nutrition, 2014; 14(4):911-924
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The use of biochar in agricultural soils appears to be promising because it is known to improve soil propertiesand increase crop production. However, few studies have been conducted with biochar on volcanic soils. Twofield experiments were conducted simultaneously to evaluate the effect of oat hull biochar (OBC) on variousphysical-chemical properties of two volcanic soils, an ‘Inceptisol’ and an ‘Ultisol’, and to evaluate the resultingeffects on the yields of barley (Hordeum vulgare) grown on these soils. The OBC doses applied to field microplotswere equivalent to 0, 5, 10 and 20 Mg ha-1. The results showed that pH, total exchangeable bases, and electricalconductivity increased at the highest dose of OBC in both soils. Glomalin-related soil protein (GRSP) wassignificantly high in the Ultisol at a rate of 20 Mg OBC ha-1. Water-stable aggregates (WSA) and mean weightdiameter (MWD) were enhanced at the highest doses of OBC in both soils. However, water-holding capacity(WHC) only increased in the Ultisol when amended with OBC at rates of 10 and 20 Mg ha-1. Barley yield (grainweight m-2) significantly increased at the highest OBC dose by 31.3% and 21.9% for crops grown on the Inceptisoland Ultisol, respectively. Significant relationships were observed between WHC and glomalin fractions (r = 0.81,p < 0.01 for easily extractable-GRSP and r = 0.62, p < 0.01 for Total-GRSP) as well as between organic C andWSA and both glomalin fractions. According to this study, biochar may be used effectively to improve the qualityof these two volcanic soils and promote sustainable grain production.
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Copyright 2014 The Chilean Society of Soil Science