Szukana fraza: [Abstract = "After four years it was clear, that the growth of pine seedlings depends mainly from nitrogen application. During the first year after additional fertilizer application the soil surface between pine seedlings rows was covered fully with grass and other plant species. The pine needles became dark green color and were longer and heavier. In the fol\-lowing 3 years the annual growth of fertilized trees was much higher."]

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