Browsing by Subject "siemenen paino"

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  • Saarsalmi, Anna; Savonen, Eira-Maija; Nikkanen, Teijo; Lipas, Erkki; Mikola, Jouni (The Finnish Society of Forest Science and The Finnish Forest Research Institute, 1994)
    The aim of the study was to obtain the information needed in preparing more precise fertilization recommendations for seed orchards. The fertilization requirement was estimated on the basis of soil and needle analyses, and by investigating the effects of different fertilization treatments on male and female flowering, the size of the seed crop and seed quality. The study was carried out in two Scots pine (Pinus sylvestris L.) seed orchards in southern Finland, one of which was established on forest soil in 1971 and 1972, and the other on a peat field in 1974. 10 clones and 39 grafts from each clone were selected randomly from both orchards in autumn 1985. There were 13 treatments per clone, with three replications. The treatments consisted of N, P and K in various combinations, micronutrients, wood ash and grass control. The orchards were fertilized in spring 1986 and the seed crops collected in 1985–1990. There were statistically significant differences between the clones in both orchards as regards amount of flowers, size of the seed crop and seed quality. The annual variation in flowering and the size of the seed crop were also large. In general, the seeds from cones collected in October matured well and their germination percentage was high. The effects of fertilization on flowering, the size of the seed crop and seed quality were small. It would appear that the size of the crop can be affected to a much greater extent by favouring clones with a high seed-producing capacity than through fertilization. Fertilization is unnecessary if the nutrient status of the soil is satisfactory.
  • Nygren, Markku (Suomen metsätieteellinen seura, 1990)