Potassium fertilization and the quality of processed coffee beans

Authors

  • Enilson de Barros Silva EPAMIG; CTNM
  • Francisco Dias Nogueira EPAMIG; CTSM
  • Paulo Tácito Gontijo Guimarães EPAMIG; CTSM

DOI:

https://doi.org/10.1590/S0103-90162002000100025

Keywords:

doses, poliphenyloxidase, coloration index, total sugars

Abstract

Climate and soil strongly influence the quality of processed coffee (Coffea arabica L.) beans. This work studied the influence of potassium fertilization on the quality of processed coffee beans grown on two Oxisols (Rhodic Acrudox and Xanthic Acrustox). Trials were set up in a completely randomized split plot block design, to test the influence of three sources and four potassium rates - potassium chloride (KCl), potassium sulphate (K2SO4) and potassium nitrate (KNO3) at 0; 100; 200 and 400 kg ha-1, applied to plants of cv. Catuaí Vermelho (3.5 x 0.7 m; one plant per hole), on the enzyme activity of poliphenyloxidase, coloration index and total sugars of processed coffee beans. The quality of beans grown under K2SO4 and KNO3 fertilization was better than that of beans grown under KCl fertilization; results of K2SO4 and KNO3 fertilizations were significantly better for the Rhodic Acrudox. Best grain quality was observed for the application of 200 kg K ha-1 as KCl and K2SO4 and 100 kg K ha-1 as KNO3.

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Published

2002-03-01

Issue

Section

Soils and Plant Nutrition

How to Cite

Potassium fertilization and the quality of processed coffee beans . (2002). Scientia Agricola, 59(1), 173-179. https://doi.org/10.1590/S0103-90162002000100025