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Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Effects of nitrogen on the selection of food by Phyllobius arborator (Herbst). | JOURNAL OF FOREST SCIENCE 54 2008 1 17-23 Effects of nitrogen on the selection of food by Phyllobius arborator Herbst E. Kula a. Peslová D. Buchtová Faculty of Forestry and Wood Technology Mendel University of Agriculture and Forestry in Brno Brno Czech Republic ABSTRACT The selection of a nutritive plant and the consumption of food Betulapendula Roth affected by differentiated inputs of nitrogen after the repeated application of ammonium nitrate into soil was monitored at Phyllobius arborator Herbst under field polythene greenhouse and laboratory Climacell conditions. In birch leaves the content of nitrogen increased. The diameter and height increment was stimulated by the application of 0.5-1 g higher doses induced stress and the fall of increment. According to the frequency of feeding marks on leaves and food consumption by weevils of the genus Phyllobius in a polythene greenhouse birch with the higher content of nitrogen was preferred. In laboratory rearing females showed higher food requirements. In short-term rearing differentiation did not occur in the amount of consumed food in males and females depending on the nitrogen content. Keywords nitrogen Betula pendula Roth Phyllobius arborator Herbst Nitrogen is an important macroelement the uptake of which by trees is carried out not only by roots from the soil environment but also in the form of ammonium or nitrate ions from liquids on the surface of leaves. It significantly affects growth properties and the creation of below-ground and above-ground biomass. High nitrogen inputs induce asymmetry in the growth of roots and assimilatory organs and the lack of nutrients due to the inhibition of K Mg2 Ca2 and water. They also lower the effectiveness of photosynthesis increment and vitality and extend the growing season. Thus the danger of frost damage to annual shoots occurs Marschner 1995 Heilmeier et al. 2000 Kulhavý Formanek 2002 Kanova Kula 2004a . Ammonia in the plants changes to amino acids and thus the .
