Fruit growth and development of pummelo cv. tubtim siam at the difference tree age and fruit age for the optimal harvesting time under the climate variation
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Abstract
The fruit growth and development of pummelo cv. Tubtim Siam at the difference tree age and fruit age for the optimal harvesting time under the climate variation was reported. The experiment was conducted at the orchard in the Klongnoi sub-district, Pak Panang district, Nakhon Si Thammarat province, Thailand starting from January, 2017 to September, 2018. The effect of the harvesting time around the year was divided to beginning of the year, mid year and end of the year which was advanced significant difference of the harvesting time. The beginning of the year and mid year could develop as indicated fruit weight(g), peel weight (g), pummelo fresh (g), diameter of fruit (cm) and fruit circumference (cm) compared to the during the time end of year. The fruit quality of the beginning of the year and mid year revealed the most higher total soluble solid (TSS), titratable acidity (TA) and TSS/TA ratio. The effect of tree age 10 and 15-year-old trees could develop as indicated fruit weight(g), peel weight (g), pummelo fresh(g) that was advanced significant difference compared to the 5-year-old trees, but the diameter of fruit (cm), fruit circumference (cm) and peel thickness was not significant difference of all treatments. The fruit quality of tree age 10 and 15-year-old trees most higher total soluble solid (TSS), titratable acidity (TA) and TSS/TA ratio than 5-year-old trees were reported. The fruit age at 6th 6.5th 7th 7.5th and 8th month was develop of fruit weight(g), peel weight (g), pummelo fresh(g), diameter of fruit (cm) and fruit circumference (cm), the result showed that fruit age at 6.5th , 7th and 7.5th month could develop the highest of fruit weight(g), peel weight (g), pummelo fresh(g), diameter of fruit (cm) and fruit circumference (cm) and highest of fruit quality as indicated of TSS, TA and TSS/TA ratio.
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