Szukana fraza: [Abstract = "The period of 9 years fallow influenced positively and the total nitrogen content and dehydrogenase activity. The contents of available forms of potassium and phosphorus, organic C did not change. The enzyme activities of urease, amylase andinvertase decreased. The pH of the fallow soils was negligible lower. The occurrence of weed species was connected with environment condition. The perennial plants and grasses were dominating."]
