Influence of abiotic factors on yields of early cultivar rootstock combinations of nectarines (Prunus persica var. nucipersica)

The study was carried out in the spring of 2017-2018 in an orchard of the Agricultural Experimental Station – Khan Krum, Shumen region.
The experimental plantation was established in the spring of 2011 years.
Early nectarine cultivars were studied: ‘Aureliogrand’, ‘Sunfree’, ‘Bigtop’, ‘Gergana’ (the first selected Bulgarian cultivar), ‘Weinberger’, ‘Nectagrand 2’, ‘Caldesi 2000’ (cultivar with white flesh) and ‘Independence’ engrafted on a seminal rootstock (Elbert) and clonal GF 677, as well as the cold hardy dessert cultivar ‘Redhaven’. During the study period, negative temperatures (-3.6 and -5.0°C) were established which coincided with the phenological phase of full blossoms as a result in the flowers of which frosting occurred in the studied cultivars (76.4-100.0%). A relatively low percentage of frozen blossoms was observed in cultivars grafted on rootstock GF 677. In 2017, the blossom damage was relatively low and yields were obtained unlike in 2018. Negative spring temperatures had a negative impact on productivity if blossom damage percentage exceeded 80%.

IX International Symposium on Seed, Transplant and Stand Establishment of Horticultural Crops and III International Symposium on Vegetable Grafting

D. Vasilev

blossoms, cold, damage, temperatures, flowers

https://doi.org/10.17660/ActaHortic.2026.1453.26