Effects of different levels of biochar on soil physical properties with different textures

Subject Areas : Farm water management with the aim of improving irrigation management indicators

Fatemeh Razzaghi ¹ , ناهید رضایی ²

1 - هیات علمی بخش مهندسی آب دانشگاه شیراز
2 - دانشجو

Received: 2016-12-31 Accepted : 2017-07-19 Published : 2017-10-23

Keywords: cation exchange capacity, water holding capacity, bulk density, saturated hydraulic conductivity,

Abstract :

Biochar is a charcoal made from biomass and animal manure, which is produced by thermal decompositionunder a limited or zero supply of oxygen. Therefore, the current research was conducted to evaluate the effect ofdifferent biochar levels on some soil physical and chemical properties in four soil types under greenhouseconditions. The experiment was performed in completely randomized design with four levels of biocharproduced from wheat straw in 500oC (0 (as control), 25, 50 and 75 ton ha-1) and four soils having varioustextures (sandy loam, loam, clay loam and clay) in three replications. Forty days after mixture of soil and biocharand determination of soil moisture content at field capacity, other physical and chemical parameters (soilmoisture at permanent wilting point, bulk and particle density, saturated hydraulic conductivity and cationexchange capacity) were measured by taking soil samples from the pots. The results showed that application ofbiochar enhanced soil physical properties. Increasing biochar levels from 0 to 75 ton ha-1 increased soil availablewater content, porosity, hydraulic conductivity and cation exchange capacity by 45, 13, 95 and 52 %,respectively. It is concluded that biochar can be used as a soil amendment in coarse textured soil to increasewater holding capacity and in fine textured soil to improve the drainage and infiltration.

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