Journal of Food Quality

Research Article

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

Table 8

3-Caffeoylquinic acid (3-CQA, %), 4-caffeoylquinic acid (4-CQA, %), 5-caffeoylquinic acid (5-CQA, %), proanthocyanidin (Pro, %), polyphenol oxidase activity (PPO, U·min⁻¹·g⁻¹), and phenolic compounds (TP, %) of coffee beans harvested from plants submitted to the fertilization via solid salts injections in the trunk or foliar sprays with B, Cu, and Zn, in the crop season 2011/2012.


Treatments	3-CQA	4-CQA	5-CQA	Pro	PPO	TP

Boron
WB	0.65	0.73	1.69	6.36	74.52	6.37
FS	0.44	0.72	1.41	5.70	85.93	5.15
B	0.44	0.58	1.35	5.53	82.07	4.21
B + Cu	0.47	0.66	1.40	6.78	85.50	4.61
B + Zn	0.45	0.64	1.38	7.14	78.38	5.50
B + Cu + Zn	0.52	0.61	1.58	6.41	74.68	6.13
CV (%)	19.89	22.27	6.36	38.15	9.01	24.59
Copper
WCu	0.65	0.73	1.69	6.36	74.53	6.38
FS	0.44	0.72	1.41	5.70	85.93	5.15
Cu	0.47	0.75	1.40	6.23	85.15	4.06
B + Cu	0.47	0.66	1.39	6.78	85.51	4.61
Cu + Zn	0.44	0.62	1.30	7.59	85.19	4.87
B + Cu + Zn	0.52	0.61	1.58	6.41	74.68	6.14
CV (%)	16.10	14.37	5.45	37.40	6.25	22.57
Zinc
WZn
T	0.65	0.73	1.69	6.36	74.52	6.37
FS	0.44	0.72	1.41	5.70	85.93	5.15
Zn	0.48	0.74	1.41	7.21	79.08	5.70
B + Zn	0.45	0.64	1.38	7.14	78.38	5.50
Cu + Zn	0.44	0.61	1.30	7.59	85.19	4.87
B + Cu + Zn	0.52	0.60	1.58	6.41	74.68	6.13
CV (%)	16.25	18.28	6.08	31.93	7.11	14.01

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.