Influence of Sources and Rates of Mineral Nitrogenous Fertilization and Bio-Stimulants on Garlic Productivity and Efficiency of Its Extracts against Pathogen Activities

Document Type : Original Article

Authors

1 Sabaheya Horticultural Research Station, Horticulture Research Institute, A.R.C., Egypt

2 Sustainable Development Department, Environmental Studies & Research Institute, Sadat City Univ., Egypt.

3 2Sustainable Development Department, Environmental Studies & Research Institute, Sadat City Univ., Egypt.

Abstract

cially via good agricultural practice; i.e., mineral nitrogen fertilization and bio-stimulants. Two field experiments
were conducted to study the influence of nitrogen fertilizer sources (ammonium sulphate and ammonium nitrate), rates (90
and 120 kg N/fed.) and bio-stimulants (Halex-2, yeast extract, Halex-2 + yeast extract and without bio-stimulants) as well
as their interactions on vegetative growth, productivity, bulb quality and chemical constituents of garlic (Allium sativum,
L.). Moreover, garlic extracts were tested against two pathogen activities (Fusarium oxysporium and Alternaria alternate).
Garlic cloves were planted during two winter seasons of 2013/2014 and 2014/2015 at a newly reclaimed area at Sadat
City, Egypt. Inoculation garlic plants with bio-stimulants showed superior effects on most of the studied characters
especially for garlic productivity. Most of the studied vegetative characters, yield, yield components and bulb quality
characteristics significantly affected with nitrogen sources, nitrogen rates and bio-stimulants as well as their interactions
during the two seasons. Inoculation garlic plants with Halex-2 + yeast extract was found to have positive effective in
reducing the mineral nitrogen fertilizer being applied by 25 % as compared with the commonly recommended dose. Data
revealed that the fertilization combination treatments; 120 kg nitrogen /fed. at the form of ammonium sulphate + Halex-2
+ Yeast extract and 90 nitrogen kg/fed. at the form of ammonium sulphate + Halex-2 + Yeast extract significantly gave
the highest values for phenol content. The plant extracts obtained from the same two previous fertilization combinations
gave the highest inhibition against Fusarium oxysporium and Alternaria alternate. The in vitro results showed that using
concentration 2.5% of the selected extracts gave the highest mycelial growth inhibition for the tested pathogens. These
results may contribute to develop environmentally safer alternatives antifungal agent against plant pathogenic fungi

Keywords

Alexandria Journal of Agricultural Sciences
Volume 62, Issue 2
April 2017
Pages 163-183

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History

  • Receive Date: 28 March 2018
  • Accept Date: 28 March 2018

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