Germination rate of sand-coated pepper (Capsicum annum L.) seed (sand grain size < 75μm for an inner coat and 75–105 μm for an outer coat layer) was faster than clay-coated seed but was slower than raw seed. Part of the germination reduction in sand-coated seeds was caused by the water-soluble Gelvatol binder used. High oxygen (O2) levels promoted the germination of sand-coated seed to a rate comparable to that of raw seed. This suggests that even with a porous sand-coating material, O2 may be limiting for the germinating seed. When inorganic O2-releasing compounds (BaO2 or NaBO3) were incorporated into the sand material, the germination of pepper seed was further inhibited.
Received for publication July 24, 1981. Florida Agricultural Experiment Station Journal Series No. 3176. The research was supported in part by a grant from Speedling Inc., Sun City, Fla. The authors gratefully acknowledge the cooperation of M. V. Crow and Mrs. S. J. Ciampi of the Florida Division of Forestry, Herren Nursery, Lake Placid, Fla., in applying the sand pelleting techniques.
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On a sabbatical leave from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel.