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Research Journal of Seed Science
  Year: 2012 | Volume: 5 | Issue: 3 | Page No.: 96-105
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Effects of Field Treatments on Barley Seed Sensitivity to Organic Seed Sanitation (Hot Water)

Saeideh Maleki Farahani and Mohammad Reza Chaichi

Seed-borne diseases are one of the most important problems in organic farming systems because of limitation in sanitation methods. Hot water treatment is one of the nonchemical seed sanitation methods that has been predominantly used in cereals. Environmental conditions like water and nutrients availability during grain development can affect on subsequent seed sensitivity to hot water. The aim of this research was to study the effect of various organic and chemical fertilizers and water deficit systems on susceptibility to hot water as an organic seed sanitation method. The field experiment was set up in two successive growing seasons of 2007 and 2008. Seeds produced under different combinations of water deficit (during grain filling) and fertilizing systems were sterilized by hot water (50°C) and then the germination and deep freeze blotter tests were conducted on sterile and none sterile seeds. Results showed that germination rate increased by hot water treatment. Although, hot water treatment significantly decreased germination percentage of seeds produced under well-water (NS) condition but significantly increased the germination percent of seeds which were produced under water stress during generative stage (MS and SS). Application of organic fertilizers including vermicompost and biofertilizer (containing phosphorus and nitrogenous fixing bacteria) increased germination of barley seed after hot water sanitation, however, fertilization with chemical or integrated (chemical+biological) fertilizers decreased germination under the same treatment. Three detected fungi viz., Fusarium spp., Alternaria spp. and Penicillium spp. were detected on different seed lots which were controlled 50-90% with hot water. Hot water is able to control most of the pathogenic fungi with little negative effect on organically produced seeds and induction of water stress during grain filling can improve seed germination after hot water treatment.
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How to cite this article:

Saeideh Maleki Farahani and Mohammad Reza Chaichi, 2012. Effects of Field Treatments on Barley Seed Sensitivity to Organic Seed Sanitation (Hot Water). Research Journal of Seed Science, 5: 96-105.




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