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The investigations were carried out in 20022005, on proper grey-brown podsoilic soil originating from light loam (class IIIa in the soil valuation system, very good rye complex), on the basis of a two-factor experiment established in 1986 according to the random block design with four replications. The arable horizon of the soil, before the experiment, was characterized by slightly acidic reaction (pH1 mol KCl dm-3 was 6.2) and the concentrations of available nutrients were as follows: 100.0 mg K, 53.2 mg Mg and 41.3 mg P kg-1 of soil. Soil samples for chemical tests were collected from the arable layer after harvesting crops grown in a rotation: sugar beet, spring barley, maize and spring wheat. The content of available forms of phosphorus and potassium were determined by Egner-Riehm method (DL), and that of manganese using Schachtschabel’s method. The purpose of the study has been to determine the influence of mineral fertilization with or without FYM on the content of available macronutrients in soil. The statistical analysis of the results have shown a significant influence of manure on the level of available P, K and Mg in the tested soil. When both FYM and mineral fertilizers were introduced to soil, its abundance in available magnesium was 2.6-fold higher than after mineral fertilization alone had been applied. FYM raised nearly 3-fold the content of available forms of potassium in soil compared to the content found when only mineral fertilization was used.
The aim of the paper was to assess the role of forest litter and mineral soil layers (0-10 and 10-20 cm) as stocks of plant-available macronutrients intheforested zone of the Karkonosze Mountains National Park, an area of forest decline at the end of 20th century. Soil samples were collected in 529 monitoring sites arranged in a 200x300 m grid. Concentrations of plant-available nutrients were much higher in the organic layer (forest litter) than in mineral soil layers, but calculated pools of available nutrients in the organic layer contributed to a lesser extent to their total pools. Those pools of nutrients stored up in the upper forest zone (1 000-1 250 m a.s.l.) proved to be significantly larger than those in the lower forest zone (500-750 m a.s.l.).
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