Adjusting Growth Stage Values to Develop a Linear Scale for Apricot Flower Bud Phenology

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  • 1 Department of Plant Science, Massey University, Palmerston North, New Zealand
  • 2 Department of Plant Science, Massey University, Palmerston North, New Zealand
  • 3 The Horticulture and Food Research Institute of New Zealand, Havelock North Research Centre, Private Bag 1401, Havelock North, New Zealand
  • 4 Plant Sciences, The University of Western Australia, Nedlands 6009, Western Australia, Australia

Integer values used to represent apricot (Prunus armeniaca L.) flower bud growth stages in a phenological scale were adjusted by a simple technique based on cumulative counts of bud observations. Adjusted stage values on a new continuous scale were calculated so that differences between consecutive values were proportional to the frequency with which buds were observed in each growth stage class during the entire assessment period. This meant that adjusted scale values were linearly related to bud development rate at 20 °C. The method was applied to a scale describing flower development from budbreak to petal fall for three cultivars of apricot growing under orchard conditions.

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Contributor Notes

Current address: The Horticulture and Food Research Institute of New Zealand, Palmerston North Research Centre, P.O. Box 11-030, Palmerston North, New Zealand.Current address: Environmental Science and Research, P.O. Box 30547, Lower Hutt, New Zealand.
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