The Scientific World Journal · Published 2026-01-01 · DOI 10.1155/tswj/1153166
This study is aimed at determining the optimal foliar application concentrations of calcium nitrate in combination with magnesium sulfate during the fruit development stage in relation to physiological disorders in 7-year-old Musang King durian. The experiment was conducted in the Mekong Delta, Vietnam, from November 2024 to April 2025. The experiment was arranged in a two-factor completely randomized block design. The first factor consisted of four Ca(NO3)2 concentrations (0%, 0.2%, 0.4%, and 0.6%), applied at 40 DAFS, whereas the second factor included four MgSO4 concentrations (0%, 0.2%, 0.4%, and 0.6%), applied at 50 DAFS. Each treatment was replicated four times, with one tree per replication. Spraying Ca(NO3)2 at a concentration of 0.2%–0.6% increased yield by 4.4%–9.4%. Different concentrations of MgSO4 did not significantly affect yield. Foliar application of 0.4% Ca(NO3)2 combined with 0.2%–0.4% MgSO4 did not induce physiological disorders. During the period from fruit development to harvest, nutrient management for Musang King durian can be divided into three soil-applied NPK fertilization events and two foliar applications of Ca(NO3)2 and MgSO4 to mitigate physiological disorders. NPK fertilizer should be applied at a rate of 0.75 kg tree−1 per application, with an N:P:K ratio of 2:1:1 at 30 days after fruit set, 2:1:3 at 45 days after fruit set, and 1:1:3 at 60 days after fruit set, in combination with foliar application of 0.4% Ca(NO3)2 at 40 days after fruit set and 0.2% MgSO4 at 50 days after fruit set.
Abstract from DOAJ. Public domain (CC0 1.0).
Read the article at the publisher →