HUMIC SUBSTANCES: A POWERFUL TOOL FOR CONTROLLING FUSARIUM WILT DISEASE AND IMPROVING THE GROWTH OF CUCUMBER PLANTS

M.M.I. Afifi, A.M. Ismail, S.M. Kamel, T.A. Essa

Abstract


The effects of humic substances (HS) and their basic components, such as humic acid 
(HA) and fulvic acid (FA), were evaluated for their ability to control Fusarium 
oxysporum f. sp. cucumerinum, as well as to improve vegetative growth of cucumber 
plants under pathogen pressure, in greenhouse conditions. Three concentrations ranging 
from 50, 100 and 150 ppm for each HS, HA and FA were tested for their efficacy in 
reducing pathogen growth. In vitro, FA extracted from green compost of plant residues 
and biogas manure significantly reduced (P = 0.05) pathogen growth at a concentration 
of 150 ppm compared to the control. FA extracted from plant residues at concentrations 
of 150 ppm reduced disease severity significantly (84.7%) in relation to other 
treatments. A significant increase in dehydrogenase enzyme activities and total number 
of microorganisms in soil were obtained by HA extracted from biogas manure with respect to other treatments. All applications significantly improved growth parameters 

of cucumber plants in the presence of natural inoculum, with the effects of HA 
treatments being more pronounced.


Keywords


Cucumber; Fulvic acid; Fusarium wilt; Humic acid

Full Text:

PDF


DOI: http://dx.doi.org/10.4454/jpp.v99i1.3810

Refbacks

  • There are currently no refbacks.


EDIZIONI ETS, Pisa, Italy