The Effect of Weed Control Method on Soil Nutrient Availability and Growth of Different Hybrid Poplar Clones
Hangs, R. D., K.J. Greer and W.R. Schroeder. 2006. Soils and Crops
Abstract
During the early establishment phase outplanted hybrid poplar seedlings are the most
vulnerable to lethargic growth or mortality because of interspecific competition with non-crop
plant species for available soil moisture and nutrients. Consequently, there is a need to develop
practical weed control practices that are not only successful at controlling non-crop plant species,
but also cost-effective for producers looking to minimize their input costs. The objectives of this
two-year study were to: i) evaluate the effects of different combinations of in-row (plastic mulch,
herbicide, and control) and between-row (tillage, herbicide, and control) weed control practices
on soil nutrients bioavailability and the early growth of four hybrid poplar clones (Walker,
Assiniboine, WP-69, and Hill) and, ii) assess the relationship between growing season soil
nutrient supply rates, measured using in situ burials of ion-exchange membrane (Plant Root
Simulator™-probes), and growth of different hybrid poplar clones. Determining the effects of
different weed control practices on growth-limiting edaphic properties and subsequent seedling
growth should help to support effective management strategies, in terms of selecting an
efficacious and cost-effective weed control strategy that promotes the establishment and growth
of hybrid poplar seedlings, while minimizing the input costs incurred by the producer.
Key Words
hybrid poplar, nutrient supply rate, Plant Root Simulator™-probes, weed control
