id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
afs-72363	Yli-Halla, Markku	Effect of different rates of P fertilization on the yield and P status of the soil in two long-term field experiments	1989	10	.pdf	application/pdf	5210	282	65	The year of harvest kg P/ha until 1982 and 0, 16, 32, 56 and 72 kg P/ha in 1983—85. The average difference between the maximum yields and the ones ob- tained without P fertilization was 470 kg/ha (12 %) in 1974—80, but during the last four years the difference increased to I 360 kg/ha (40 %), owing to the depletion of P in the plots not fertilized with P. Also in the other experiment, in which the maximum yield of cereal grains (4 790 kg/ha) was obtained at the P rate of 26/32 kg/ha, the response to P fertilization in- creased towards the end of the trial, the mean response during the last three years being 570 kg/ha (12 %).	cache/afs-72363.pdf	txt/afs-72363.txt