Research Article
Boron, Copper, and Zinc Affect the Productivity, Cup Quality, and Chemical Compounds in Coffee Beans
Table 6
Coloration index (CI, DO 425 nm), total titratable acidity (TTA, mL of NaOH 100 g−1), pH, electrical conductivity (EC, µS·cm−1·g−1), and leached potassium (KL, g·kg−1) of coffee beans of Coffea arabica treated with different forms of B, Cu, and Zn supply, in the crop season 2011/2012.
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WB, WCu, and WZn: control treatments, without application of B, Cu, and Zn, respectively; FS; foliar spray with boric acid, copper sulphate, and zinc sulphate (0.4%); B: trunk injection of tablets containing B salts; Cu: trunk injection of tablets containing Cu salts; Zn: trunk injection of tablets containing Zn salts; B + Cu: trunk injection of tablets containing B and Cu salts; B + Zn: trunk injection of tablets containing B and Zn salts; Cu + Zn: trunk injection of tablets containing Cu and Zn salts; B + Cu + Zn: trunk injection of tablets containing B, Cu, and Zn salts; mean values are statistically different from those of the control treatment (FS) at the 10% significance level, according to Dunnett’s test; mean values are statistically different from those of the control treatment (WB-WCu-WZn) at the 10% significance level, according to Dunnett’s test. |