Effect of Calcium Chloride on Physiological Change in Flowering Phase to Fruit Set of Longan Trees
DOI:
https://doi.org/10.14456/jare-mju.2024.21Keywords:
photosystem II, stomatal conductance, off seasonAbstract
Longan (Dimocarpus longan Lour.) is an important economic fruit widely grown in Northern Thailand. The flowering on off-season of longan can be done by artificial flower induction by soil or foliar application of potassium chlorate. High temperatures or drought stress have negative effects on physiological changes of longan. The aim of this study was to decrease the high temperatures of longan leaves by foliar application of CaCl2. The ‘Daw’ longan trees were planted in 14-inch of plastic bags under a plastic greenhouse at the Pomology farm, Faculty of Agricultural Production, Maejo University, Chiang Mai, Thailand. The growing substrate was coco peat and coconut husk (1:1) with 1 liter of fertigation every day. The experiment design was a completely randomized design (CRD) with 5 treatments of CaCl2 spraying at 0, 0.5, 1, 2 and 4 mM. The result showed that CaCl2 had no significant effect on the quantum yield of PSII (øPSII) and total chlorophyll (SPAD value). However, foliar spraying of CaCl2 did not make a significant difference in the maximum quantum yield of PSII (Fv/Fm) from January to March, but spraying of all CaCl2 concentrations maintained Fv/Fm efficiency and stomatal conductance better than no spraying in April. In addition, foliar treatment with 4 mM CaCl2 had a higher fruit set than other treatments.
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