Fig. 1.
Fig. 1.

Schematic diagram of columns used for tension and moisture probe measurements.

 


Fig. 2.
Fig. 2.

(A) Gravimetric and (B) volumetric water retention curves for rootzone sand, and sand amended with 15% v/v Canadian sphagnum peat (CSP), calcined clay (CC), or diatomaceous earth (DE).

 


Fig. 3.
Fig. 3.

(A) Gravimetric and (B) volumetric water content with depth for rootzone sand, and sand amended with 15% v/v Canadian sphagnum peat (CSP), calcined clay (CC), or diatomaceous earth (DE) overlaying 7.6 cm of gravel meeting U.S. Golf Association specifications.

 


Fig. 4.
Fig. 4.

Cumulative drainage with time for rootzone sand, and sand amended with 15% v/v Canadian sphagnum peat (CSP), calcined clay (CC), or diatomaceous earth (DE) overlaying 7.6 cm of gravel meeting U.S. Golf Association specifications.

 


Fig. 5.
Fig. 5.

Flux with time for rootzone sand, and sand amended with 15% v/v Canadian sphagnum peat (CSP), calcined clay (CC), or diatomaceous earth (DE) overlaying 7.6 cm of gravel meeting U.S. Golf Association specifications.

 


Fig. 6.
Fig. 6.

Pressure potential with depth for rootzone sand, and sand amended with 15% v/v Canadian sphagnum peat (CSP), calcined clay (CC), or diatomaceous earth (DE) overlaying 7.6 cm of gravel meeting U.S. Golf Association specifications.

 


Fig. 7.
Fig. 7.

Flux during a 24-h drainage period for rootzone sand, and sand amended with 15% v/v Canadian sphagnum peat (CSP), calcined clay (CC), or diatomaceous earth (DE).

 


Fig. 8.
Fig. 8.

Estimation of volumetric water content (θv) from the water retention curve at 7 depths within a 40-cm rootzone for the first 24 h following drainage for rootzone sand, and sand amended with 15% v/v Canadian sphagnum peat (CSP), calcined clay (CC), or diatomaceous earth (DE).