Cultivar Differences in the Response of the Fruiting Characteristics of Camellia oleifera Abel to the Concentration of Potassium Dihydrogen Phosphate during Foliar Spraying
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Published:2024-08-02
Issue:8
Volume:10
Page:817
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ISSN:2311-7524
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Container-title:Horticulturae
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language:en
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Short-container-title:Horticulturae
Author:
Liu Huiyun1, Wang Jiawei1, Zeng Huijie1, Ren Zhihua1, Cheng Li1, Zhang Yunyu2, Cheng Qinhua3, Shi Xueyun1, Zhou Zengliang4, Hu Dongnan1
Affiliation:
1. Jiangxi Key Laboratory of Subtropical Forest Resources Cultivation, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China 2. Xinyu Forestry Development Service Center, Xinyu 338099, China 3. Gannan Arboretum, Ganzhou 341299, China 4. Jiangxi Academy of Forestry, Nanchang 330032, China
Abstract
One of the main reasons for the low yield of Camellia oleifera Abel is the large number of flowers and fruits that fall off before ripening. The aim of this study was to investigate the effect of foliar spraying of potassium dihydrogen phosphate (KH2PO4) on the fruiting characteristics of C. oleifera, and to provide technical support for its flower and fruit preservation and yield increasing. Three C. oleifera cultivars, ‘Changlin 18’, ‘Changlin 166’, and ‘Changlin 40’, were used as experimental materials to conduct foliar spraying experiments with different water concentrations of KH2PO4. The effects of KH2PO4 on the fruit retention rate, fruit properties, and seed oil quality of each cultivar were measured and analyzed. The application of the optimal concentration of KH2PO4 significantly enhanced various fruit quality metrics of three C. oleifera cultivars. Specifically, the total fruit retention rate was increased by 30.02~87.53%, the transverse diameter by 7.36~21.21%, and the longitudinal diameter by 18.56%, and the fruit weight of ‘Changlin 40’ could increase by 83.63%. It also increased dry seed yield by 27.87~80.81%, dry kernel rate by 10.29~30.12%, dry seed oil content by 28.00~29.77%, total unsaturated fatty acids (TUFAs) by 0.63~5.3%, monounsaturated fatty acids (MUFAs) by 0.30~5.37%, and squalene by 0.09~0.14% during the maturing stage. However, camellia cultivars had the different responses to KH2PO4 concentrations. To promote the fruiting of C. oleifera, improve the economic traits of fruits, and enhance the quality of tea oil, the recommended concentrations of KH2PO4 solution are 4.50 g·L−1, 1.50 g·L−1, and 1.50 g·L−1, for mist spraying on the trees of ‘Changlin 18’, ‘Changlin 166’, and ‘Changlin 40’, respectively. For mixed cultivars of C. oleifera which planted randomly, the recommended concentration range of KH2PO4 solution for spraying is 1.50 to 4.50 g·L−1.
Funder
Key R&D PlanUnveiling and Leading Projects in Jiangxi Province National Natural Science Foundation of China
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