Abstract
Abstract “Hardening” tomato, carrot, and radish seed by means of a 2% solution of potassium nitrate, or by means of three wetting and drying cycles had no effect on final germination percentage; but hardening reduced the time to 50% germination and reduced the spread of germination at 20°c both in vitro and in simulated field conditions. Similar in vitro results were obtained at 6–8°c, except that final germination percentage of untreated tomato and radish seed was significantly lower than treated seed.
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