id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
afs-5682	SLAFER, G. A.; PELTONEN-SAINIO, P.	Yield trends of temperate cereals in high latitude countries from 1940 to 1998	2001	12	.pdf	application/pdf	6201	303	65	Yield gains in absolute and relative terms were calculated for comparison among countries and cereals. Wheat also showed a bilinear trend with only limited yield gains until the 1960s, followed by a more than 3-fold increase in rate of yield gain from then on (16 and 40 kg ha–1 y–1, respectively).	cache/afs-5682.pdf	txt/afs-5682.txt