Determine the appropriate dose of nitrogen, phosphorus, and potassium fertilisers for Booth 7 avocado variety in the commercial stage grown on basaltic soil in Dak Lak province

Abstract

The objective of this study was to determine the appropriate dosage of nitrogen, phosphorus, and potassium fertilisers for the Booth 7 avocado variety in the commercial stage on red-brown basaltic soil in Dak Lak province. The results showed that the formula (NPK)3 = 300 kg N+150 kg P₂O₅+300kg K₂O/ha/year was suitable with the variety, made its growth tend to increase, as well as attain the highest yield, reaching 21.93 tons of fruit/ha in the 2017 harvest and 23.6 tons of fruit/ha in the 2018 harvest. High fertiliser levels (NPK)2 = 200 kg N+100 kg P₂O₅ +200kg K₂O/ha/year and (NPK)3 = 300 kg N+150 kg P₂O₅ +300 kg K₂O/ha/year increased fruit weight compared with the level (NPK)1 = 100 kg N+50 kg P₂O₅+100 kg K₂O/ha/year. There was no evidence on the effect of NPK fertiliser levels on the percentage of seed, peel, flesh, and quality parameters.