Abstract
Abstract Second-order rectangular hyperbolic and asymptotic models which predict spur and terminal leaf expansion of ‘Montmorency’ sour cherry (Prunus cerasus L.) were developed from leaf area observations and temperature records made in orchards near East Lansing, Mich. Average leaf area per leaf was more highly correlated with degree-day accumulation at a base of 4°C starting April 19, than with day of the year. Leaf area per leaf increased linearly with degree-day accumulation until full leaf expansion. Final spur or terminal leaf size was not constant between years.
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