Tiina Heinonen 
Haavikon lannoituskoe.
Heinonen T. (1983). Haavikon lannoituskoe. Silva Fennica vol. 17 no. 1 article id 5174. https://doi.org/10.14214/sf.a15089
English title: A fertilization experiment in a Populus tremula standAbstract
The growth response of aspen (Populus tremula L.) to fertilization was studied in an experiment laid out in a naturally regenerated 35-year old stand on a previously burned-over land. The site was rather fertile. One-tree plot method was used. Applications of nitrogen (150 kg/ha as ammonium nitrate with lime), phosphorus (35 kg/ha as superphosphate), and potassium (66 kg/ha as potassium chloride) separately and in all possible combinations were used; the test included 11 replications. The growth reaction was measured as basal area growth excluding bark during 5 years. The factorial effects were computed using Yates method.
Potassium did not have any effect on basal growth of the trees. The response to phosphorus was also rather small. On the other hand, nitrogen appeared to have increased the basal area growth. The growth increase obtained with nitrogen alone was greater than when it was applied together with phosphorus and/or potassium.
The PDF includes a summary in English.
Original keywords
lannoitus;
haapa;
pohjapinta-ala;
typpi
English keywords
Populus tremula;
fertilization;
nitrogen;
aspen;
basal growth
Published in 1983
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