id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
afs-71728	Kaila, Armi	Residual effect of rock phosphate and superphosphate	1969	7	.pdf	application/pdf	3159	177	65	No phosphate Rock phosphate Superphosphate In trial K 104 the increase in the phosphorus yield by rock phosphate appears to be only about 60 per cent of that by superphosphate. In these trials, however, from the third to the sixth test crops, repeated application of equal amounts of phosphorus either as rock phosphate or as superphosphate gave the same response in the dry matter yields, but, at least in the red clover-timothy ley of 1959, the phosphorus content of the hay from the rock phosphate plots was distinctly lower than that from the superphosphate plots, mainly because of the poor uptake ofapatite phosphorus by grasses (Kaila and Hänninen 1960).	cache/afs-71728.pdf	txt/afs-71728.txt