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Apparent Growth Inhibitor in Hulls of Peanut¹

Because peanut [Arachis hypogea (L.)] hulls have been suggested as a substitute for sphagum moss in starter cubes for seedling growth, we tested extracts from variously treated hulls for their effects on germination and seedling growth. In these preliminary studies, we found a water-soluble, inhibitory substance that was inactivated by heat. The substance appeared to be an inherent part of the hull of some peanut types. Inhibitory activity was not detected in all lots of peanut hulls tested, but use of untreated hulls in starter cubes would not be advisable until a means to consistently remove the inhibitory substance has been found.

Key Words: Starter cubes

² Plant physiologist and research chemist, Field Crops Laboratory Richard B. Russell Agric. Res. Ctr., USDA, SEA, Athens, GA 30604.

Received for publication November 3, 1977.