Suo - Mires and peat vol. 45 no. 3 | 1994
Lannoitemaaran vaikutus lyhytkiertoviljelmien ravinnetilaan ja biomassatuotokseen suonpohjilla.
English title: Effect of fertilizer application rate on nutrient status and biomass production in short-rotation plantations of willows on cutaway peatland areas.
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The effects of N, P and K fertilizer application rates on the biomass production, soil properties and foliar nutrient status were studied in willow plantations (Salix x dasyclados, Salix 'Aquatica') established on cut-away peatland areas at Haapavesi (64 06'N, 25 36'E and Ruukki (64'27'N, 25 26'E). When the amount of one of the nutrients in NPK-fertilization was changed (N 0-200 kg/ha, P 0-60 kg/ha, K 0-80 kg/ha) the others remained unchanged (N 100, P 30, K 40 kg/ha). Three field experiments were made. Increasing phosphorus and potassium application rates increased the concentrations of corresponding soil extractable nutrients. There was a positive correlation between the fertilizer application rate and the concentrations of foliar nitrogen, phosphorus and potassium. During the first growing season, the effect of nitrogen fertilization on biomass production was modest, but during the second growing season the yield of willows increased the most when fertilized with 100-150 kg N/ha. Although phosphorus fertilization increased yields, already the smallest amounts (15 kg/ha) resulted in biomass yields as high when applying the largest phosphorus fertilizer amounts (60 kg/ha). Potassium fertilization did not increase biomass production in any of the experiments. The highest total biomass yields after three growing seasons were 28-30 t/ha. Their compositions were as follows: 44% wood, 18% bark, 17% foliage, 16% roots, and 5% stumpwood.
Key words: biomass production, cut-away peatland, fertilization, energy forestry, Salix
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Hytönen,
The Finnish Forest Research Institute, Kannus Research Station, Box 44, FIN-69J 01 Kannus, Finland
Sähköposti:
ei.tietoa@nn.oo
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