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- W256104042 abstract "One objective of tree improvement programs is mass production of genetically superior seed. Such seed is usually collected in grafted or in seedling seed orchards from selected trees. White spruce (Picea glauca (Moench) Voss) is widely planted in the Lake States, and seed orchards are now being established to produce genetically superior seed. What will these orchards yield? We present here some early answers to this question. Our results are limited to clonal orchards. Wright (1964) reported that moderate numbers of cones can be found occasionally on 6to 10-year-old white spruce and that most trees produce cones in quantity by the time they are 10 to 15 years old. Planted white spruce in northeastern Wisconsin apparently do not produce moderate cone crops until they are much older. For example, in an unfertilized planting of trees 21 years old from seed, only 10 out of 23 selected trees could be included in a pollination program requiring a minimum of 10 pollination bags per tree .2 There are several reports in the literature on the potential seed production from grafted material of other species. Among these are cone and seed production of 12year-old grafted Scotch pine (Hadders and Ahgren 1958), cone and seed yields from pine seed orchards (Johnsson 1961), and production of Norway spruce seed in orchards (Ruden 1961). Johnsson reported considerable variation among clones of Scotch pine in the number of cones and seed produced per clone. Van Buijtenen (1966) reported on the effect of spacing, fertilization, and cultivation on flowering and seed production in loblolly pine. To our knowledge there are no reports on potential seed production from white spruce clonal orchards." @default.
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- W256104042 date "1970-01-01" @default.
- W256104042 modified "2023-09-28" @default.
- W256104042 title "Potential seed production from a White Spruce clonal seed orchard." @default.
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