ISHS Acta Horticulturae 121: VII Symposium on Apricot Culture and Decline
ESTIMATE OF CHILLING REQUIREMENTS OF APRICOT SELECTIONS II |
| Authors: | C. H. BAILEY, S. KOTOWSKI, L.F. HOUGH |
| Abstract:
Apricots cannot be grown commercially in New Jersey, USA, because of the fluctuating winter temperature and subsequent cold injury to both wood and buds. In our efforts to develop cultivars that will be adapted to New Jersey climate, we have tried to identify parental selections with high chilling requirements and slow release from rest (Bailey et al., 1978). Thermograph records were kept, time of tetrad formation was determined, and time of first bloom recorded. Chilling requirements and growing degree hours (GDH) required for full release from rest were determined using the methods of Richardson et al. (1974, 1975). Three selections, NJA11 - early blooming, NJA31 - mid-early blooming, and 15–10 - late blooming were studied for four years. | |
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