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Effects of Four Amendments on Soil Physical and on Yield and Quality of Putting Greens¹

Synopsis: Peat and vermiculite increased penetrability. Hydraulic conductivity was increased by fired clay and decreased by vermiculite and colloidal phosphate. Fired day and peat increased noncapillary pore space while vermiculite and colloidal phosphate produced a decrease. Grass yield and quality were increased by vermiculite and cotloidal 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 grassproducing ability of soil mixtures.

² Assistant Turf Technologist, Plantation Field Lab., Ft. Lauderdale, Fla., and Soils Technologist and Associate Soils Physicist, respectively, Fla. Agr. Exp. Sta., Gainesville.

Received for publication December 18, 1961.

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