Carl Johan Westman 
Urealannoituksen vaikutus metsämaan kasveille käyttökelpoiseen typpimäärään.
Westman C. J. (1974). Urealannoituksen vaikutus metsämaan kasveille käyttökelpoiseen typpimäärään. Silva Fennica vol. 8 no. 2 article id 4902. https://doi.org/10.14214/sf.a14746
English title: Effect of urea application on nitrogen available for plants in forest soilAbstract
The paper describes a preliminary attempt to assess the long-term effect of urea application on the quantity of nitrogen available for plants in forest soil. The soil samples required for the study were collected from an experimental area which had been set up for investigations into both the single and joint effect on tree growth of two levels of each of urea and phosphorus application. The stand was a mixed forest of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) H. Karst.) on Myrtillus type site with an average volume of 217.5 m3/ha.
According to the results, the nitrogen available for plants of the humus layer was significantly higher in fertilized than in unfertilized plots as late as four years after application. In terms of absolute values, the quantities were extremely small, only 3–4% of the amounts applied. In comparison with these results it was interesting to notice that urea application seemed to increase the C/N ratio.
The PDF includes a summary in English.
Original keywords
kuusi;
mänty;
lannoitus;
urea;
typpilannoitus;
kasveille käyttökelppoinen typpi
English keywords
Norway spruce;
fertilization;
Scots pine;
urea;
nitrogen fertilization;
available nitrogen
Published in 1974
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