Szalay, L., & Szabó, Z. (1999). Blooming time of some apricot varieties of different origin in Hungary. International Journal of Horticultural Science, 5(1-2), 16-20. https://doi.org/10.31421/IJHS/5/1-2/14
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There are a number of self-incompatible and partially self-compatible apricot varieties which need cross pollination for suitable yield. We have to know their blooming time to select the appropriate pollen donor cultivars. The blooming period of 20 apricot varieties was observed in four subsequent years. Blooming time was affected by temperature conditions very much. Varieties studied were assigned to three groups according to their blooming time. The rate of overlapping of important variety combinations was observed. Sufficient overlapping of blooming period for safe pollination is usually ensured within the same group of varieties or between varieties of the neighbouring blooming time groups.