Tropical Grasslands (1982) Volume 16, 50–55

INFLUENCE OF SHORT DURATION, HIGH TEMPERATURE SEED TREATMENT ON THE GERMINATION OF SOME TROPICAL AND TEMPERATE LEGUMES

J.J. MOTT, S.J. COOK and R.J. WILLIAMS

CSIRO, Division of Tropical Crops and Pastures, 306 Carmody Road, St. Lucia, Qld. 4067. Australia.

Abstract

Seed of thirteen pasture and two horticultural legumes was subjected to high temperature dry heat treatment for short periods of time and the effect on hardseededness, germination and seed viability determined. Optimum treatments, which maximised hard seed break and minimised seed death, reduced hard seed contents by two- to three-fold and caused only a small amount of seed death. Optimum treatment varied between species, and between seed lots within species; this ranged from 160°C for 60 seconds to 140°C for 15 seconds. Increasing severity of the treatment killed an increasing proportion of the soft seed initially present.

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