Author：You-Hong Zeng^1*, Wen-Lung Lay, Ya-Wen Kuo, and Hong-Tang Chen⁴

Abstract：

    Typhoons often damage crops and then influence agricultural economy in Taiwan. In this study, foliar application on fruit trees before typhoon season would be implemented for increasing strength of fruit trees and clarifies the possibility of foliar application on decrease fruit trees damage by typhoons. The four new born and similar branches respectively in the east, west, south and north aspect of the guava tree would be labeled for investigation after severe pruning. Foliar application was applied once every 7–10 days and continuous three times respectively in April and July before typhoon and then investigation of the horticultural characteristics and elemental contents of leaf and fruit before and after typhoon. The guava leaf thickness was significantly increased after spaying nutrient solutions by comparison with spaying water. The specific leaf weight was increased by foliar application of 10 mM KNO₃ combined with KH₂PO₄, 15 mM CaSO₄ and 60 mM KH₂PO₄. After typhoon Matmo, the leaf breakdown rates were significantly decreased by applying 10 mM KNO₃ combined with 10 mM CaSO₄, 15 mM CaSO₄ and 60 mM KH₂PO₄ in non-windbreak net covered field. Foliar application of the 15 mM CaSO₄ and 60 mM KH₂PO₄ can decrease leaf breakdown rate of guava pot after exposure to wind. The total soluble solids and boron content of guava fruits were increased by applying 10 mM KNO₃+10 mM CaSO₄+10 mM KH₂PO₄. Fruit number was significantly increased by spaying the10 mM KNO₃+10 mM CaSO₄+10 mM KH₂PO₄, 10 mM KNO₃+10 mM CaSO₄,10 mM CaSO₄+10 mM KH₂PO₄ and 60 mM KH₂PO₄. The study results showed the foliar application of 15 mM CaSO₄ and 60 mM KH₂PO₄ would be high applied potential in decrease typhoon damage on fruit tree.

Keywords: Typhoon, Foliar Application, Guava.

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¹ Taichung District Agricultural Research and Extension Station, Council of Agriculture, Executive Yuan. zengyh@tdais.gov.tw.
² Taichung District Agricultural Research and Extension Station, Council of Agriculture, Executive Yuan. laywe@tdais.gov.tw.
³ Taichung District Agricultural Research and Extension Station, Council of Agriculture, Executive Yuan. kuoyw@tdais.gov.tw.
⁴ Taichung District Agricultural Research and Extension Station, Council of Agriculture, Executive Yuan. chenhgtg@tdais.gov.tw.
* Corresponding Author, Email: zengyh@tdais.gov.tw; Tel: 04-8523101#311.

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