The Recept and Use of Nitrogen Form by Transplants of Spruce and Pine

1985

9 Tab.

Unselbständiges Werk

2264

200007009

Früherer Titel: früher u.d.T. : Prace VULHM

The application of the stabile isotpe 15N when following the nourishment of forest woods offers great possibilities by observing the questions round nitrogen as the flowers nourishment because the isotope technics has the possibility to define almost each rest of the applicated nitrogen. The stabile isotopes are for the research of fixation of molecular nitrogen unreplaceable. The technics of marked atoms was much used when studying the problems with the nourishment of field crops but in the forestry management was used occasionally only. We have chosen for the following of receipt and use of the applicated nitrogen from soil by transplants of common spruce and pine the vegetation experiment with the pots. For the planting in them we selected the spruce transplants at age of 2 years and pine seedlings of 1 yea. We filled the pots with the fine soil and silicon sand without soluble nutrients. The experiment for each wood was started in five variants: with soil without manuring, 3 variants with soil manured by enriched nitrogen manure for the determination of receipt of ammonium, nitrate and amide form of nitrogen and a variant with sterile silicon sand without nutrients. The whole volume of nitrogen in plants and their parts was after the manuring expressively higher. The increment of the whole content of nitrogen of spruce plant was during manuring with ammonium nitrate 34% and with urine manuring 46%of the whole capacity of nitrogen in the plants unmanured. Most nitrogen is centralized in needles of one and two years and in the roots without regard to variant. By pine transplants most nitrogen is concentrated in needles and roots. The concentratin if nitrogen in percentages of dry matter on spruce was not differentiated due to individual variants not even on needles of one year or in needles at all. On pine the transplants umanured differ expressively from manured ones as to concentration of nitrogen in needles as in roots. The receipt of nitrogen from manure by spruce transplants is highest by needles at age of one year and in the roots and withot essential differences among individual forms of nitrogen. The receipt of nitrogen by transplants of pine is highest in needles. The whole receiving of nitrogen from ammonium nitrate is twice as big as the whole receipt of nitrogen from urea. The pine transplants have accepted the ammonium nitrogen from manure more than from nitrate of 36%. The vegetation pot experiment we evaluated by comparing the similar experiment realized in the conditions of forest nurseries. From those comparisons of all values of content and receipt of nitrogen and biometrical values we reduce that though the conditions of experiments are different, the said vegetation pot experiment for the following the questions of nourishment of the transplants of spruce and pine by nitrogen is applicable. Finally we can the results ..