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3/2008 vol. 53
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ORIGINAL PAPER
Number of aphids (Hom. Aphididae) on conventional and organic crops of potato and winter wheat compared to chemical composition of plants
M. Kelm
,
 
Z. Spiak
,
 
I. Fostiak
,
 
M. Romanowska
 
 
 
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Journal of Research and Applications in Agricultural Engineering 2008;53(3):133-137
 
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References (15)
 
KEYWORDS
aphid
potato
winter wheat
chemical composition
conventional crop
organic crop
 
ABSTRACT
In years 2002-2004, occurrence of aphids on conventional and organic crops of potato and winter wheat in three localities in Lower Silesia were observed. In case of potato, there was significantly higher number of aphids on organic crops than on conventional ones. Chemical analysis show higher content of protein and nitrogen and twice lower content of phosphorous in potato tops from organic crops. Reversely, there was higher number of aphids on wheat plants grown in conventional than organic farms. Probably it resulted from much higher content of protein and nitrogen in plant tissue from conventional crops. Additionally, in grains of this wheat there was less of potassium and three times more of phosphorus.
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