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Effects of foliar spraying of maternal plant by different fungicide on the health, germination and vigour of soybean seeds

Document Type : Research Paper

Authors

1 Ph.D. Student, Department of Agronomy, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran

2 Associate Professor, Department of Agronomy, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran.

3 Assistant Professor, Department of Plant Protection, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran

Abstract

In order to investigate effects of different fungicide spraying treatments on soybean seed quality, a split plot experiment was conducted in a randomized complete block design with three replications in research field of Gorgan University of Agricultural Science and Natural Resources in 2016. Two spring (May 28) and summer (July 10) planting dates performed at main plots and fungicides spraying including benomyl, mancozeb, propiconazole, methyl thiophanate, carbendazim and control in two stages R3 and R6 were done in sub plots. Germination, accelerated aging, electrical conductivity, and seed health tests were used to evaluate the quality of seeds. Two fungi Alternaria sp. and Fusarium sp. spread were observed in seed lots, but lower prevalence for Fusarium sp.. Therefore, seed health was most affected by Alternaria sp.. The percentage of healthy seeds in spring sowing date was 21.48% higher than summer sowing date. All used fungicides (especially propiconazole and methyl thiophanate) significantly increased the health, germination, and vigor of seeds compared to control. The produced seeds in summer planting despite of more fungal infection, had higher seed germination and vigor than seeds of spring crops, because of exposing the seed development stages (R5-R8) to low temperatures. In the fact that, air temperature during seed development stages was more important in determining seed germination and vigor compared to pathogens. Therefore, in order to achieve high seed quality, it is appropriate to use summer planting with the utility of suitable fungicides such as propiconazole and methyl thiophanate at R3 and R6 growth stages.

Keywords

References
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Journal of Crops Improvement
Volume 21, Issue 2
July 2019
Pages 167-180
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