id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
afs-72353	Hartikainen, Helinä	Effect of cumulative fertilizer dressings on the phosphorus status of mineral soils II Comparison of two phosphorus testing methods	1989	6	.pdf	application/pdf	3311	174	67	Clay soils Coarser soils Poor 1.4 1.9 Rather poor 1.5—2.9 2.0—4.9 Fair 3.0 5.9 5.0 9.9 Satisfactory 6.0—11.9 10.0—19.9 Good 12.0—29.9 20.0—39.9 High 30.0—69.9 40.0—69.9 In fact, the paired t-statistics revealed that the estimates for soil P obtained by NH4OAc extraction and those by water extraction differed significantly in the clay soils, where- as in the coarser ones the differences remained statistically insignificant. A similar variation in the reactivi- ty of soil P with respect to these extractants can be seen in the data published by Sippola and Jaakkola (1980).	cache/afs-72353.pdf	txt/afs-72353.txt