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Abstract
Abstract Subsoil loosening of an 8‐year‐old dryland pasture soil (Templeton silt loam) at either of two depths (27 or 47 cm) resulted in a significant (P 10%) in soil bulk density and a concomitant increase in soil porosity compared with undisturbed soil. The hydraulic conductivity of the loosened soil was significantly (P < 0.05) greater than that of the undisturbed soil, reflecting the increased pore continuity within the depth of loosening. These more rapid drainage rates resulted in a drier soil profile at the start of spring, 10 months after subsoil loosening. These improved soil physical conditions permitted more rapid root growth and the development of a more extensive pasture root system with a significantly (P < 0.1) greater (36%) root length below 30 cm depth. Subsoil loosening resulted in significant increases in pasture production over the first 3 months of spring (August‐October).
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