Abstract
SynopsisPeat and vermiculite increased penetrability. Hydraulic conductivity was increased by fired clay and decreased by vermiculite and colloidal phosphate. Fired clay and peat increased noncapillary pore space while vermiculite and colloidal phosphate produced a decrease. Grass yield and quality were increased by vermiculite and colloidal phosphate treatments. Turf yield and quality decreased with an increase in hydraulic conductivity and in the force required to penetrate the soil. Bulk density was not a satisfactory index of grass‐producing ability of soil mixtures.
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