Journal of Food Quality

Research Article

Boron, Copper, and Zinc Affect the Productivity, Cup Quality, and Chemical Compounds in Coffee Beans

Table 5

Coloration index (CI, DO 425 nm), total titratable acidity (TTA, mL NaOH 100 g⁻¹), pH, electrical conductivity (EC, µS·cm⁻¹·g⁻¹), leached potassium (KL, g·kg⁻¹), total sugars (TS, %), and reducing sugars (RS, %) in coffee beans of Coffea arabica treated with different forms of B, Cu, and Zn supply, in the crop season 2010/2011.


Crop season 2010/2011

Boron
Treatments	CI	TTA	pH	EC	KL	TS	RS
WB	0.81	11.2	5.61	41.39	1.29	11.73	0.216
FS	0.89	10.4	5.60	42.71	1.40	11.41	0.197
B	0.84	10.0	5.60	41.36	1.30	11.63	0.212
B + Cu	0.93	10.4	5.58	41.84	1.29	12.09	0.199
B + Zn	0.91	10.8	5.50	41.09	1.23	9.70	0.279
B + Cu + Zn	0.93	11.2	5.61	38.87	1.23	11.28	0.264
CV (%)	12.03	20.05	1.35	14.26	12.67	13.91	34.39
Copper
Treatments	CI	TTA	pH	EC	KL	TS	RS
WCu	0.81	11.2	5.61	41.39	1.29	11.73	0.216
FS	0.89	10.4	5.61	42.71	1.40	11.41	0.197
Cu	0.87	10.4	5.60	41.98	1.36	11.48	0.221
Cu + B	0.93	10.4	5.58	41.84	1.29	12.09	0.199
Cu + Zn	0.88	11.6	5.58	38.14	1.18	12.20	0.211
B + Cu + Zn	0.93	11.2	5.61	38.87	1.23	11.28	0.264
CV (%)	10.76	24.48	0.75	13.8	13.67	14.16	20.22
Zinc
Treatments	CI	TTA	pH	EC	KL	TS	RS
WZn	0.80	11.2	5.61	41.39	1.29	11.73	0.216
FS	0.89	10.4	5.60	42.71	1.40	11.41	0.197
Zn	0.90	11.2	5.62	41.09	1.32	12.13	0.209
Zn + B	0.91	10.8	5.50	41.09	1.23	9.70	0.279
Zn + Cu	0.88	11.6	5.58	38.14	1.18	12.20	0.211
B + Cu + Zn	0.93	11.2	5.61	38.87	1.23	11.28	0.264
CV (%)	11.06	17.27	1.45	16.7	14.13	17.24	35.64

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.