Abstract
The objective of the study was to determine the appropriate doses of micro-organic and phosphorus fertilizers for good growth, high rhizomes yield and enhancing the economic efficiency of red turmeric cultivated in gray soil in Thu Duc city. The two factor experiment was laid out in a split-plot design with three replications. The main plots consisted of four doses of phosphorus fertilizer as 30, 60 (control), 90, & 120 kg P2O5/ha. The sub-plots included three doses of micro-organic fertilizer (2, 4, & 6 tons/ha) and a control with cow dung of 10 tons/ha. A common dose of 500 kg lime, 90 kg N, 120 kg K2O/ha was applied in all treatments The results showed that red turmeric was applied at the dose of 120 kg P2O5 combined with 6 tons of micro-organic fertilizer/ha exhibited the highest growth, yield and economic outcomes including a plant height of 41.2 cm, stem diameter of 16.2 mm, leaf length of 24.4 cm, leaf width of 8.5 cm, leaf count of 7.0, soil plant analysis development index of 35.6, the profit of VND 386.32 million/ha, and the benefit cost ratio of 2.4.
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