Effects of Nitrogen Fertilizer Rate on Quality of Puko Pomelo (Citrus grandis (L.) Osbeck) cv. Puko
Keywords:
Nitrogen fertilizer, Pomelo, Puko, Fruit qualityAbstract
The study of effects of nitrogen fertilizer rate on quality of Puko pomelo was carried out from March 2018 to February 2019 at a pomelo orchard in Momawi sub-district, Yarang district, Pattani province. The objectives of this research were to examine 3 nitrogen fertilizer rates as follows: 1) an application of nitrogen fertilizer at 1 kg. per tree (T1), 2) an application of nitrogen 2 kg. per tree (T2), and 3) an application of nitrogen 3 kg. per tree (T3). Puko pomelo fruits were harvested at 28 weeks after its flowers bloomed. From the experiments, the different rates of nitrogen application did not show significant difference in the number of inflorescences per branch, fruit set percentage, fruit weight, fruit width, fruit height, total soluble solid (TSS), total acid percentage (TA), vitamin C and Chlorophyll. The trees receiving nitrogen fertilizer at 3 kg. per tree produced fruits with high levels of sucrose, glucose, fructose, total sugar and lycopene at 98.6, 31.2, 11.7, 141.5 (g/l) and 2.15 (mg/100 ml), respectively, which was significantly different from the trees receiving nitrogen fertilizer at 1 and 2 kg. per tree. As for the trees receiving nitrogen fertilizer at 1 kg. per tree, their fruits had the highest level of limonin (3.9 mg/l) and b-carotene (0.64 mg/100 ml) and the lowest levels of lycopene (1.37 mg/100 ml). To conclude, the Puko pomelo trees received high nitrogen rate produced the highest fruit quality because nitrogen was the most needed chemical element for pomelo trees.
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