2005, 2006) and Scots pine ( Pinus sylvestris L.) seedlings in May and late August – early September in Finland ( Luoranen and Rikala 2013). For example, Norway spruce ( Picea abies (L.) Karst.) seedlings are suggested to plant from May to the end of September ( Luoranen et al. The mechanization of planting work is one solution to the above mentioned problems ( Nilsson et al. In addition, the number of forest laborers is decreasing. This short period is busy, both in the nurseries and forests. In conclusion, it is possible to plant conifer seedlings in the boreal forest zone up to October under non-limiting field conditions.Ĭonventionally, conifer seedlings are planted in spring from May through early June. During the initial two years after planting, the shoot growth of spring-planted seedlings was lower, compared to autumn-planted seedlings. There was no difference in the timing of shoot flush for various planting dates. In the following spring, seedlings which were planted in early-autumn started their root growth faster than late-autumn-planted seedlings in both species. The root growth of planted seedlings declined in September and ceased after mid-September. Seedlings of both species were planted in a nursery field trial, and in a clearcut reforestation site from August to October and the following May. This study examined the timing of root growth just after planting, shoot flush and the start of root growth the following spring, and subsequent field performance. This study investigated how the summer- (August) and autumn-, especially late autumn (mid-September to mid-October) plantings affect the field performance of Scots pine ( Pinus sylvestris L.) and Norway spruce ( Picea abies (L.) Karst.) container seedlings. There is a need to extend the planting season of conifer regeneration into periods where the soil remains unfrozen due to a lack of available labor and the mechanization of planting. Although Scots pine and Norway spruce seedlings planted in late autumn may have a slightly reduced growth, it is possible to plant them if weather conditions are favorable in late-autumn, without increased mortality.
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