id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
afs-71676	Elonen, Paavo; Nieminen, Lasse; Kara, Osmo	Sprinkler irrigation on clay soils in southern Finland II. Effect on the grain yield of spring yereals	1967	12	.pdf	application/pdf	4165	221	65	The authors consider, however, that the main reason was a different one: When the clay loam was drying, a fairly compact layer on the boundary between plough layer and subsoil hardened, and the plant roots were not able to penetrate this layer before it was moistened by irrigation water. In the dry growing seasons 1964, 1965 and 1966, irrigation experiments of spring cereals were carried out on clay soils in Southern Finland.	cache/afs-71676.pdf	txt/afs-71676.txt