Biochar amendment to coarse sandy subsoil improves root growth and increases water retention

Esben Wilson Bruun, Carsten T. Petersen, Emilie Hansen, Jens Kai Holm, Henrik Hauggaard-Nielsen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Crop yields and yield potentials on Danish coarse sandy soils are strongly limited due to restricted root growth and poor water and nutrient retention. We investigated if biochar amendment to subsoil can improve root development in barley and significantly increase soil water retention. Spring barley (Hordeum vulgare cv. Anakin) was grown in soil columns (diameter: 30 cm) prepared with 25 cm topsoil, 75 cm biochar-amended subsoil, and 30 cm un-amended subsoil lowermost placed on an impervious surface. Low-temperature gasification straw-biochar (at 0, 0.50, 1.0, 2.0, and 4.0 wt%) and slow pyrolysis hardwood-biochar (at 2 wt%) were investigated. One wt% can be scaled up to 102 Mg/ha of char. After full irrigation and drainage, the in-situ moisture content at 30-80 cm depth increased linearly (R2 = 0.99) with straw-biochar content at a rate corresponding to 0.029 m3/m3/%. The lab determined wilting point also increased linearly with char content (R2 = 0.99) but at a much
lower rate (0.003 m3/m3/%). Biochar at concentrations up to 2% significantly increased the density of roots in the 40–80 cm depth interval. Addition of 1% straw-biochar had the most positive effect on root penetration resulting in the highest average root density (54% coverage compared to 33% without biochar). This treatment also resulted in the greatest spring barley grain yield increase (22%). Improving the quality of sandy subsoils has global potentials, and incorporation of the right amount of correctly treated residues from bioenergy technologies such as straw-biochar is a promising option.
OriginalsprogEngelsk
TidsskriftSoil Use and Management
Vol/bind30
Udgave nummer1
ISSN0266-0032
DOI
StatusUdgivet - mar. 2014
Udgivet eksterntJa

Emneord

  • Biochar
  • subsoil
  • root development
  • soil moisture content

Citer dette

Bruun, Esben Wilson ; Petersen, Carsten T. ; Hansen, Emilie ; Holm, Jens Kai ; Hauggaard-Nielsen, Henrik. / Biochar amendment to coarse sandy subsoil improves root growth and increases water retention. I: Soil Use and Management. 2014 ; Bind 30, Nr. 1.
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abstract = "Crop yields and yield potentials on Danish coarse sandy soils are strongly limited due to restricted root growth and poor water and nutrient retention. We investigated if biochar amendment to subsoil can improve root development in barley and significantly increase soil water retention. Spring barley (Hordeum vulgare cv. Anakin) was grown in soil columns (diameter: 30 cm) prepared with 25 cm topsoil, 75 cm biochar-amended subsoil, and 30 cm un-amended subsoil lowermost placed on an impervious surface. Low-temperature gasification straw-biochar (at 0, 0.50, 1.0, 2.0, and 4.0 wt{\%}) and slow pyrolysis hardwood-biochar (at 2 wt{\%}) were investigated. One wt{\%} can be scaled up to 102 Mg/ha of char. After full irrigation and drainage, the in-situ moisture content at 30-80 cm depth increased linearly (R2 = 0.99) with straw-biochar content at a rate corresponding to 0.029 m3/m3/{\%}. The lab determined wilting point also increased linearly with char content (R2 = 0.99) but at a much lower rate (0.003 m3/m3/{\%}). Biochar at concentrations up to 2{\%} significantly increased the density of roots in the 40–80 cm depth interval. Addition of 1{\%} straw-biochar had the most positive effect on root penetration resulting in the highest average root density (54{\%} coverage compared to 33{\%} without biochar). This treatment also resulted in the greatest spring barley grain yield increase (22{\%}). Improving the quality of sandy subsoils has global potentials, and incorporation of the right amount of correctly treated residues from bioenergy technologies such as straw-biochar is a promising option.",
keywords = "Biochar, subsoil, root development, soil moisture content, Biochar, subsoil, root development, soil moisture content",
author = "Bruun, {Esben Wilson} and Petersen, {Carsten T.} and Emilie Hansen and Holm, {Jens Kai} and Henrik Hauggaard-Nielsen",
year = "2014",
month = "3",
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Biochar amendment to coarse sandy subsoil improves root growth and increases water retention. / Bruun, Esben Wilson; Petersen, Carsten T.; Hansen, Emilie; Holm, Jens Kai; Hauggaard-Nielsen, Henrik.

I: Soil Use and Management, Bind 30, Nr. 1, 03.2014.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Biochar amendment to coarse sandy subsoil improves root growth and increases water retention

AU - Bruun, Esben Wilson

AU - Petersen, Carsten T.

AU - Hansen, Emilie

AU - Holm, Jens Kai

AU - Hauggaard-Nielsen, Henrik

PY - 2014/3

Y1 - 2014/3

N2 - Crop yields and yield potentials on Danish coarse sandy soils are strongly limited due to restricted root growth and poor water and nutrient retention. We investigated if biochar amendment to subsoil can improve root development in barley and significantly increase soil water retention. Spring barley (Hordeum vulgare cv. Anakin) was grown in soil columns (diameter: 30 cm) prepared with 25 cm topsoil, 75 cm biochar-amended subsoil, and 30 cm un-amended subsoil lowermost placed on an impervious surface. Low-temperature gasification straw-biochar (at 0, 0.50, 1.0, 2.0, and 4.0 wt%) and slow pyrolysis hardwood-biochar (at 2 wt%) were investigated. One wt% can be scaled up to 102 Mg/ha of char. After full irrigation and drainage, the in-situ moisture content at 30-80 cm depth increased linearly (R2 = 0.99) with straw-biochar content at a rate corresponding to 0.029 m3/m3/%. The lab determined wilting point also increased linearly with char content (R2 = 0.99) but at a much lower rate (0.003 m3/m3/%). Biochar at concentrations up to 2% significantly increased the density of roots in the 40–80 cm depth interval. Addition of 1% straw-biochar had the most positive effect on root penetration resulting in the highest average root density (54% coverage compared to 33% without biochar). This treatment also resulted in the greatest spring barley grain yield increase (22%). Improving the quality of sandy subsoils has global potentials, and incorporation of the right amount of correctly treated residues from bioenergy technologies such as straw-biochar is a promising option.

AB - Crop yields and yield potentials on Danish coarse sandy soils are strongly limited due to restricted root growth and poor water and nutrient retention. We investigated if biochar amendment to subsoil can improve root development in barley and significantly increase soil water retention. Spring barley (Hordeum vulgare cv. Anakin) was grown in soil columns (diameter: 30 cm) prepared with 25 cm topsoil, 75 cm biochar-amended subsoil, and 30 cm un-amended subsoil lowermost placed on an impervious surface. Low-temperature gasification straw-biochar (at 0, 0.50, 1.0, 2.0, and 4.0 wt%) and slow pyrolysis hardwood-biochar (at 2 wt%) were investigated. One wt% can be scaled up to 102 Mg/ha of char. After full irrigation and drainage, the in-situ moisture content at 30-80 cm depth increased linearly (R2 = 0.99) with straw-biochar content at a rate corresponding to 0.029 m3/m3/%. The lab determined wilting point also increased linearly with char content (R2 = 0.99) but at a much lower rate (0.003 m3/m3/%). Biochar at concentrations up to 2% significantly increased the density of roots in the 40–80 cm depth interval. Addition of 1% straw-biochar had the most positive effect on root penetration resulting in the highest average root density (54% coverage compared to 33% without biochar). This treatment also resulted in the greatest spring barley grain yield increase (22%). Improving the quality of sandy subsoils has global potentials, and incorporation of the right amount of correctly treated residues from bioenergy technologies such as straw-biochar is a promising option.

KW - Biochar

KW - subsoil

KW - root development

KW - soil moisture content

KW - Biochar

KW - subsoil

KW - root development

KW - soil moisture content

U2 - 10.1111/sum.12102

DO - 10.1111/sum.12102

M3 - Journal article

VL - 30

JO - Soil Use and Management

JF - Soil Use and Management

SN - 0266-0032

IS - 1

ER -