id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
afs-71323	Kaila, Armi; Kivinen, Pertti	Observations on the effect of organic materila upon aggregation and nitrate-nitrogen content of soil	1952	8	.pdf	application/pdf	3182	150	54	Generally, the degree of immobilization of soil nitrogen seemed largely to depend on the properties of soil and on other environmental conditions, and nitrogen applications, theoretically enough for the needs of microorganisms that decomposed the strawr , could not always prevent an intensive absorption of soil nitrogen. The silt soil used in the former experiment seems to have been richer in mo- bilizable nitrogen than the latter one, the finesand clay sample, since in the former the double amount of nitrogen fertilizers has been enough to maintain the level of nitrate-nitrogen equal to that in the untreated one.ln spite of nitrogen applications, after an incubation of 240 days no mineral nitrogen could be found in the finesand clay sample treated with straw.	cache/afs-71323.pdf	txt/afs-71323.txt