Walker Poplar

Lindquist, C. H.; CRAM, W. H.; HOWE, I. A. G.

doi:10.4141/cjps77-151

Cited by 13 publications

(6 citation statements)

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“…Although not statistically significant, using basal or mid cuttings for 'Northwest' increased height growth by 12% and 7%, respectively when compared to distal cuttings. The more rapid growth rate, characteristic of the 'Walker' clone (Lindquist et al 1977) was evident in this study as height of 'Walker' after one growing season was greater than 'Northwest'.…”

Section: Resultssupporting

confidence: 49%

Effect of cutting position on rooting and shoot growth of two poplar clones

Schroeder¹,

Walker²

1991

New Forest

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One-year-old shoots from stooling beds of Populus X deltoides 'Walker' and Populus jackii 'Northwest' were collected in late fall to determine the effect of cutting position on rooting and growth of hardwood poplar cuttings. Cuttings with a minimum diameter of 9.0 mm were obtained from basal, middle and distal locations on the poplar shoot. Rooting and shoot growth were assessed in the greenhouse and under field conditions. 'Walker' poplar cuttings collected from basal portions of the shoot and planted in the field had 87.6% rooting and 103.8 cm growth compared to 78.8% and 103.4 cm and 67.6% and 88.8 cm for middle and distal locations respectively. For 'Northwest' rooting and growth under field conditions was 84.4% and 94.7 cm for basal, 78.4% and 90.5 cm for mid and 64.4% and 84.3 cm for distal locations. Rooting in the greenhouse was superior to the field. 'Walker' cuttings had fewer roots and buds per cutting than 'Northwest', however, growth of 'Walker' in the field was superior.Application.For optimum rooting of poplars only the highest quality cuttings should be used. Cutting quality and rootability are dependent on a number of factors including position of cutting on the parent shoot. Using cuttings from basal and mid shoot locations would significantly increase the rooted cutting production of some poplar clones.

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Section: Resultssupporting

confidence: 49%

Effect of cutting position on rooting and shoot growth of two poplar clones

Schroeder¹,

Walker²

1991

New Forest

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“…4460,4461,4462,4463,4464,4465,4466,4467,4468,4471,4472,4473,4474,4475,4476,4480,4484,4485,4486 4469,4470,4477,4479,4481,4482,4487,4488,4490,4491,4494,4495,4496,4498,4500,4502,4503,4508,4509,4511,4515 (Table 1) and include interspecific crosses between Populus deltoides (D), Populus nigra (N), Populus balsamifera (B), P. maximowiczii (M), and P. × petrowskyana (P. laurifolia × P. nigra). Two related poplar clones, widely planted across the Canadian Prairies, the female clone 'Walker ' (Populus deltoides × (P. laurifolia × P. nigra)) (Lindquist et al 1977) and male progeny clone 'Okanese' ('Walker' × (P. laurifolia × P. nigra)) (Schroeder et al 2013) were used as reference clones. Both clones are of economic importance in shelterbelts and, more recently, in short rotation intensive crop (SRIC) plantations (Goehing et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Growth parameters and resistance to Sphaerulina musiva-induced canker are more important than wood density for increasing genetic gain from selection of Populus spp. hybrids for northern climates

Niemczyk

Thomas

2020

Annals of Forest Science

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“…The two hybrid poplar clones were the female clone Walker (Populus deltoides × (P. laurifolia × P. nigra)) (Lindquist et al 1977) and the male clone Okanese (Walker × (P. laurifolia × P. nigra)) (Schroeder et al 2013). The two related intersectional hybrids were selected due to their economic importance in shelterbelts and, more recently, in short-rotation intensive-culture (SRIC) plantations across the Canadian Prairies and their contrasting growth forms, resource requirements, and sensitivity to competition (van Oosten 2006;Schroeder et al 2013;Doornbos et al 2016).…”

Section: Study Area and Experimental Designmentioning

confidence: 99%

Spatial partitioning of competitive effects from neighbouring herbaceous vegetation on establishing hybrid poplars in plantations

et al. 2019

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The spatial effects of vegetation control on early tree growth were investigated in central Alberta, Canada, for four years after the establishment of hybrid poplar plantations including the two clones Walker (Populus deltoides × (P. laurifolia × P. nigra)) and its progeny Okanese (Walker × (P. laurifolia × P. nigra)). Tree survival and growth, herbaceous vegetation cover, soil nutrient availability, moisture, temperature, and light availability were assessed. Tree growth in the first two years after establishment was improved through selective in-row vegetation control close (within 50 cm) to trees for both aboveground (mechanical) and above-and below-ground (chemical) control. This was associated with increased light availability for trees. In contrast, growth in the third and fourth years benefitted from control of aboveground vegetation within 140 cm of the stem, and this was associated with increased nutrient availability. These findings suggest that the effects of neighbouring vegetation on trees shift from aboveground competition near the tree stem to belowground competition further (>50 cm) away; thus betweenrow vegetation control is more important starting in the third year after establishment. Okanese outperformed Walker poplar across all treatments and was more responsive to vegetation control, reflecting its superior performance, higher plasticity, and greater potential for short-rotation intensive-culture plantations.

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Walker Poplar

Abstract: Walker poplar has proven superior to other poplar clones in Saskatchewan with respect to growth and resistance to disease. This poplar has been widely planted on the Canadian Prairies as a shelterbelt tree.

Cited by 13 publications

References 0 publications

Effect of cutting position on rooting and shoot growth of two poplar clones

Effect of cutting position on rooting and shoot growth of two poplar clones

Growth parameters and resistance to Sphaerulina musiva-induced canker are more important than wood density for increasing genetic gain from selection of Populus spp. hybrids for northern climates

Spatial partitioning of competitive effects from neighbouring herbaceous vegetation on establishing hybrid poplars in plantations

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