id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
afs-72256	Niskanen, Raina	Release of phosphorus, aluminium and iron in fractionation of inorganic soil phosphorus 	1987	5	.pdf	application/pdf	2400	166	64	Pro- portions of P extracted by 0.5 M NH 4F (0.2—10.4 mmol/kg soil) and 0.1 M NaOH (0.1— 9.8 mmol/kg soil) were related to the molar ratio of oxalate-extractable iron and aluminium. Al extracted by 0.1 M NaOH (7 —174 mmol/kg soil) and 0.25 M H 2 S04 (17 —112 mmol/kg soil) amounted to 55—94 % and 16—245 °7o of oxalate-extractable Al, respectively.	cache/afs-72256.pdf	txt/afs-72256.txt