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  • Author or Editor: C. H. Beeman x
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Abstract

Cold resistance of current season shoots and trunk bark of ‘Red Delicious’ apple trees were compared with seasonal temperature through 4 winters. Cold resistance was measured by electrolytic conductance and recorded as T10 and T90. There was correlation between cold resistance and the temperature during 7 days preceding cold acclimation measurement. Sustained temperature below 0°C increased cold resistance more than did very low temperature interrupted by short periods above freezing.

Open Access

Abstract

Electrolytic conductance was measured from acclimated and nonacclimated seedlings of apple, pear and citrus which were frozen and unfrozen. A close correlation between electrolytic conductance and survival was shown. A comparison was made between conductance and injury of apple and pear trees in the natural freeze of 1968-69 in Washington. Procedures are outlined for using conductance as a measure of cold tolerance among cultivars or treatments within the same cultivar. The use of T10 and T90, which describes the transition range of injury, is outlined and described. Procedures are also outlined for following acclimation or deacclimation through the year and for determining freeze-injury from natural freezes.

Open Access

Abstract

Large and small cabbage transplants of three cultivars were selected from plots produced from large, medium, small, and unsized seed. Physical measurements and yield data were obtained. Analysis of the means and the plant-to-plant variation showed the principal responses to be more readily accounted for by genetic than environmental factors. Plants of ‘King Cole’ were less variable than the other cultivars in height of heading.

Open Access