STUDIES ON SUITABLE NPK FERTILIZER DOSAGE FOR DA XANH POMELO (Citrus grandis L.) GROWING IN BEN TRE PROVINCE

Abstract

The aim of this study is to determine the appropriate dosage and ratio of fertilizer for Daxanh pomelo during the production cycle in Ben Tre province. Ten experiments with different formulas were conducted in 2 years on the area of 07-year-old Daxanh pomelo. The efficiency of fertilizer is determined on the basis of calculating yield, quality of pomelo and economic efficiency. The results showed that the formula with the highest yield and quality of pomelo was CT7 formula (370 g N + 445 g P₂O₅ + 370 g K₂O + 40 kg Manure)/plant/year. The net yield in CT7 formula was 82.79 (in 2020) and 59.60 (in 2021) kg/plant CT7 formula also gave the best fruit quality with average dry matter content of 10.54% and 9.97%. The Brix level in the CT7 formula is statistically significantly higher than the control formula and reaches from 10.65 to 11.08%. In both years, 2020 and 2021, CT7 gave the highest economic efficiency with the profit is 161.65 million VND/ha/year (2020) and 49.94 million VND/ha/year (2021).