id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
afs-5832	RIESINGER, P.; HYVÖNEN, T.	Weed occurrence in Finnish coastal regions: a survey of organically cropped spring cereals	2006	19	.pdf	application/pdf	10377	583	64	In the first national weed survey carried out in Finland, Mukula et al. (1969) attributed geographi- cal differences of frequency of occurrence and abundance of weed species to differences in climate and soil properties. Another measure that has a selective impact on weed species is seed cleaning (Svensson and Wigren 1986).	cache/afs-5832.pdf	txt/afs-5832.txt