Growth and foliar nutrition of a hybrid poplar clone following the application of a mixture of papermill biosolids and lime mud

Author:

Bilodeau-Gauthier Simon12,Palma Ponce Gustavo32,Miquel Jean-Charles2,Lafleur Benoit32,Brais Suzanne32,Bélanger Nicolas42

Affiliation:

1. Direction de la recherche forestière, Ministère des Forêts, de la Faune et des Parcs, Complexe scientifique, 2700, rue Einstein, Québec, QC G1P 3W8, Canada.

2. Centre d’étude de la forêt, Université du Québec à Montréal, 141, avenue du Président-Kennedy, Montréal, QC H2X 1Y4, Canada.

3. Institut de recherche sur les forêts, Université du Québec en Abitibi-Témiscamingue, 445, boulevard de l’Université, Rouyn-Noranda, QC J9X 5E4, Canada.

4. Département science et technologie, Université TÉLUQ, 5800, rue Saint-Denis, bureau 1105, Montréal, QC H2S 3L5, Canada.

Abstract

Fertilization of hybrid poplar (HP) plantations with papermill by-products is a promising solution to improve soil fertility and nutrient availability, increase plantation productivity, and provide added value to these materials that would otherwise be incinerated or sent to the landfill. We assessed the growth and foliar nutrition of a HP clone (Populus ×canadensis × Populus maximowiczii) at six plantation sites aged 3–5 years in southern Quebec, Canada. Sites received a fertilization treatment consisting of a mixture of papermill biosolids (120 to 140 t·ha−1, depending on site) and lime mud (10 to 15 t·ha−1) before being planted, or no fertilization (control). Tree growth was significantly improved by fertilization, with fertilized trees showing a mean annual height increment of 1.3 m (all-site mean; SD = 0.2), compared with 0.5 m (SD = 0.4) for unfertilized trees. Foliar calcium and magnesium increased following fertilization and levels met optimal thresholds at all sites, whereas nitrogen, phosphorous, and potassium concentrations also increased, but nutritional deficiencies remained for these elements at several sites. Our results confirm the benefits of fertilizing hybrid poplars with papermill by-products, but they also indicate that adjustments in application rates or type of by-products could be made to fully satisfy nutritional requirements and thus optimize tree growth.

Publisher

Canadian Science Publishing

Subject

Ecology,Forestry,Global and Planetary Change

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