Foliar top dressing as a way to increase plum productivity potential in arid conditions of the northern caspian sea

In 2022–2024, the effect of foliar top dressing on the yield and quality of domestic plum fruits in the arid conditions of the Astrakhan region was studied. It was shown that the Great Blue variety on the BBA-1 rootstock demonstrated a statistically justified increase in yield with the combined use of Aquarin, Ultramag boron and Ultramag calcium preparations, which amounted to an increase in fruit yield of 1.1 t/ha compared with the control. The variant using fertilizers Ultramag boron and Ultramag calcium also showed an increase in plum yield of 0.8 t/ha. A statistically significant increase in yield was recorded on the Eureka-99 rootstock due to the interaction of the preparations Ultramag boron and Ultramag calcium, which amounted to 0.7 t/ha compared with the control. In the Aquarin variant, an additional 0.4 t/ha increase was achieved. The Great Blue variety was isolated on the VVA-1 rootstock, which showed maximum productivity. The average yield of this variety in all studied top dressing options was 5.8 t/ha. These indicators slightly exceeded the yield of the Zainap variety, which amounted to 5.7 t/ha. Although the difference was small, it was statistically significant, which indicated the superiority of the Great Blue variety in this rootstock under the conditions of the experiment. It was noted that the Great Blue variety had an average fruit weight of 53.8 g, exceeding the control by 3.4 g. The Zainap variety was characterized by an average fruit weight of 47.2 g, which exceeded the control by 4.1 g.

plum, variety, foliar top dressing, yield, fruit weight, preparations