Abstract
The purpose of the present paper was an assessment of the dynamics of the regrowth of the shoots of 10 genotypes of basket willow (Salix viminalis L.) in the 9th and 10th year of cultivation on light soil in the Middle Pomerania (16°24’N and 54°8’E) with a diversified planting density of cuttings (15.020, 22.134 and 33.200 pcs. ha-1). The field experiment was established in 2007 with 3 planting densities of willow cuttings, and 10 willow genotypes. In 2016–2017, the regrowth dynamics of willow shoots was assessed separately in the first and second row of the plot. The willow genotype, the planting density of cuttings during the establishment of the plantation, the number of the years of shoot regrowth and variants of shoots mowing had an impact on the willow canopy architecture in the 9th and 10th year. The reaction of genotypes with the individual parameters of the canopy architecture was not identical.
Highlights
Biomass harvested for energy purposes constitutes a significant source of renewable energy in Poland and in Europe [3–5, 18]
Dying out of willow snags in the first 3-year cycle with cultivation on very heavy alluvial soil near Kwidzyn depended on the variety, planting density of cuttings and harvest frequency, yet it did not exceed 10% of planting independently of the experiment variant [10]
The research factors used in the experiment had a significant impact on the canopy architecture (Table 1)
Summary
Biomass harvested for energy purposes constitutes a significant source of renewable energy in Poland and in Europe [3–5, 18]. In the production of willow biomass, snag planting per one hectare in the whole 25-year cycle of its cultivation is important. Dying out of willow snags in the first 3-year cycle with cultivation on very heavy alluvial soil near Kwidzyn depended on the variety, planting density of cuttings and harvest frequency, yet it did not exceed 10% of planting independently of the experiment variant [10]. Research concerning dynamics of willow biomass growth during years of cultivation are performed in Poland mainly in the first 3–4 year rotation [8, 10–12, 14, 17]. These measurements may serve for the current forecasting of the willow biomass yield [11]
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