Influence of foliar fertilising on adaptation characteristics of plum varieties under arid conditions of the Astrakhan region

Abstract

The article presents the results of the influence of out-root fertilizing on the parameters of the leaf surface of varieties of domestic plums in arid conditions of light chestnut soils of the Northern Caspian. The study was conducted at the experimental site of the Caspian Agrarian Federal Scientific Center of the Russian Academy of Sciences. The pilot site was laid in 2014. Records and observations were carried out in 2019-2021. The research materials were varieties of plums Kuban early, Renclod Altana, Burbank and out-root leafy fertilizing preparations Master, Aquarin, Ultramag boron and Ultramag calcium. The leading indicators of the production process include the leaf surface area, photosynthetic capability and the net efficiency of photosynthesis, which show a close direct relationship with yield. Developing an optimal leaf surface area is an essential component of the technology and is vital for effectively absorbing light energy for photosynthesis. Analysis of the effects of micro-fertilizers Aquarin and Ultramag boron at the same time Ultramag calcium on the parameters of the leaf surface of plum trees showed that the most responsive varieties for the use of this drug were the Kuban early and Burbank varieties. The Renkloda Althana variety responded better to the action of the Master preparation. The largest leaf area formed on 1 ha, relative to the control, differed in the variant with the combined use of Aquarin, Ultramag boron and Ultramag calcium, which amounted to 3671 m2. Among the varieties, the Burbank variety was characterized by the largest leaf area formed per 1 ha, in which this indicator was 3080 m2.