Biochar has a low density and high porosity. Much like sphagnum moss, it can be difficult to wet when dry, but can hold large amounts of water. When applied to sandy soil, biochar can improve soil water holding capacity (Briggs et al., 2005; Tryon, 1948; Fig. 9), although different biochar materials differ in their ability to positively impact soil water retention. Novak et al. (2009b) found that biochar made from switch grass improved the water holding capacity of a light textured Norfolk soil more than biochars made from pecan shells, peanut hulls and poultry litter. Biochar applied to clay soils has been found to have no significant effect on water holding capacity (Major, 2009), or to reduce it (Tryon, 1948). Researchers in areas where water availability for farming is low are interested in the potential of biochar to retain moisture, either applied by irrigation or received from rain events, and release this moisture to crops as the soil dries. However, to date no data has been published to demonstrate specifically that water retention by biochar can alleviate water stress in plants and result in improved yields because of this effect.
ไบโอชาร์ มีความหนาแน่นต่ำ และมีรูพรุนสูง เหมือนพืชมอสมอส , มันสามารถยากที่จะเปียกเมื่อแห้ง แต่สามารถถือจำนวนมากของน้ำ เมื่อใช้กับดินทราย ไบโอชาร์สามารถปรับปรุงดินน้ำความจุถือ ( Briggs et al . , 2005 ; ไทรอัน 2491 ; รูปที่ 9 ) แม้ว่าวัสดุไบโอชาร์ต่าง ๆแตกต่างกันในความสามารถของพวกเขาที่จะส่งผลกระทบทางบวกในดินน้ำ โนวัค et al . (2009b) found that biochar made from switch grass improved the water holding capacity of a light textured Norfolk soil more than biochars made from pecan shells, peanut hulls and poultry litter. Biochar applied to clay soils has been found to have no significant effect on water holding capacity (Major, 2009), or to reduce it (Tryon, 1948). Researchers in areas where water availability for farming is low are interested in the potential of biochar to retain moisture, either applied by irrigation or received from rain events, and release this moisture to crops as the soil dries. However, to date no data has been published to demonstrate specifically that water retention by biochar can alleviate water stress in plants and result in improved yields because of this effect.
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