Early marketable yield and better berry skin color of ‘Redglobe’ grapevines cultivar grown under warm climate by application of Sulis®

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Coloration of red grapes under high temperature and narrow day/night temperature range conditions is a great challenge. The aim of the investigation was to test the effect of Sulis® fertilizer which has recently commercially released in Egypt on the color of ‘Redglobe’ grapes. In 2018, the treatments were water (control), 1 ml L-1 Sulis®, or 2 ml L-1 Sulis®. ‘Redglobe’ berries were darker red color due to Sulis® treatments, with no different effect between both Sulis® concentration. While, The 2019 treatments were water (control), 150 mg l-1 ABA + 250 mg l-1 Ethephone, 1 ml L-1 Sulis®+ 250 mg l-1 Ethephone, or 1 ml L-1 Sulis®. During both seasons, the treatments gave the same effect on physical berry characteristics. The bunches sprayed with ABA or Sulis® +ethephone were harvested 10 days earlier than those treated with Sulis® alone, and 20 days earlier than the control clusters. The treatments gave higher packable yield percentages at first pick harvest and SSC/TA ratio than the control. L*, a*, b*, C* and h˚ of berry color traits were decreased due to the treatment applications. Sulis®+ethephone and Sulis® treatments increased the red color index and anthocyanin content in berry skin than the control treatments. Sulis® fertilizers is promising as a coloring agent in grapevines cultivation.