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Effects of straw incorporation on Rhizoctonia solani inoculum in paddy soil and rice sheath blight severity

Published online by Cambridge University Press:  05 July 2013

H. ZHU ,
Z. X. WANG ,
X. M. LUO ,
J. X. SONG  and
B. HUANG
H. ZHU
Affiliation:
Key Laboratory of Microbial Control, Anhui Agricultural University, Hefei 230036, People's Republic of China
Z. X. WANG
Affiliation:
Key Laboratory of Microbial Control, Anhui Agricultural University, Hefei 230036, People's Republic of China
X. M. LUO
Affiliation:
Anhui Academy of Forestry, Hefei 230031, People's Republic of China
J. X. SONG
Affiliation:
Key Laboratory of Microbial Control, Anhui Agricultural University, Hefei 230036, People's Republic of China
B. HUANG*
Affiliation:
Key Laboratory of Microbial Control, Anhui Agricultural University, Hefei 230036, People's Republic of China
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

Incorporation of rice straw into soil has traditionally been an important method of recycling nutrients and improving soil productivity. Currently, although the effects of straw incorporation on disease severity have been documented, the dynamics of the pathogen in soil after straw incorporation are poorly understood. In the present study, rice straw with various proportions of diseased straw was incorporated at three separate locations (SuPu town, SuSong County and FengYang County) in Anhui province, China. The pathogen dynamics in paddy soil and disease severity of sheath blight during two continuous years from April 2010 to April 2012 were investigated. For all three locations, the amount of pathogen inoculum that persisted in the soil increased with increases in the proportion of diseased straw incorporated. Incorporation of 0·3 and 0·5 diseased straw into soil increased the amount of pathogen inoculum in the soil significantly, whereas incorporation of 0·1 diseased straw into soil had no significant effect on the pathogen inoculum compared with the control (no straw incorporated) or disease severity. Incorporation of healthy rice straw (no disease) resulted in a significant decrease in disease severity, whereas proportions of 0·3 and 0·5 diseased straw resulted in a significant increase of disease severity compared with the control. These results suggested that incorporation of diseased straw enhanced pathogen numbers in soil during the whole decomposition period and increased disease severity. To avoid soil-borne disease accumulation, severely diseased straw should be removed from the field or pre-treated before incorporation.

Type
Crops and Soils Research Papers
Information
The Journal of Agricultural Science , Volume 152 , Issue 5 , October 2014 , pp. 741 - 748
Copyright
Copyright © Cambridge University Press 2013 

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