De-Inking Paper Sludge Amendment Affects Weeds in the Presence or Absence of Herbicide in a Soybean-Corn Rotation

• Published in: Agronomy journal Vol. 102; no. 1; pp. 340 - 347
• Main Authors: Machrafi, Younes, Wamegni, Josué, Beauchamp, Chantal J, Tremblay, Gilles, Chalifour, François-P
• Format: Journal Article
• Language: English
• Published: Madison American Society of Agronomy 01.01.2010
• Subjects: Agricultural practices; Agronomy. Soil science and plant productions; annuals; application rate; Biological and medical sciences; broadleaf weeds; carbon; Chemical control; corn; Crop rotation; Cropping systems. Cultivation. Soil tillage; de-inking paper sludge; dry matter accumulation; field crops; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Generalities. Cropping systems and patterns; Glycine max; grain crops; grass weeds; land application; nitrogen; Other nutrients. Amendments. Solid and liquid wastes. Sludges and slurries; Parasitic plants. Weeds; Phytopathology. Animal pests. Plant and forest protection; plant growth; pulp and paper sludge; Sludge; soil amendments; Soil-plant relationships. Soil fertility. Fertilization. Amendments; Soybeans; waste utilization; weed control; Weeds; Zea mays; Quebec; Monocotyledones; C4-Type; Paper waste; Organic fertilization; Sewage sludge; Cereal crop; Deinking; Gramineae; Dicotyledones; Agronomy; Angiospermae; C3-Type; Vegetals; Zea mays; Weed; Pesticides; Cropping system; Glycine max; Herbicide; Grain legume; Leguminosae; Crop rotation; Spermatophyta; Oil plant (vegetal); Organic amendment
• ISSN: 0002-1962; 1435-0645
• DOI: 10.2134/agronj2009.0046

The application of de-inking paper sludge (DPS), a C-rich but N-poor soil amendment, can sometimes decrease plant growth. This property needs to be investigated to develop the knowledge and management methods necessary for potential weed control. Today, there is no information on the effectiveness of using DPS to control weeds within a soybean [Glycine max (L.) Merr.]-corn (Zea mays L.) rotation. The objective of this study was to determine the effects of 0, 25, or 50 Mg/ha DPS applied yearly, combined with the absence or the presence of herbicides, on weed abundance and biomass. The experimental sites were St. Augustin de Desmaures for a 4-yr rotation sequence (soybean-corn-soybean-corn) and St. Hyacinthe for a 3-yr rotation sequence (soybean-corn-soybean) in northeastern Canada. Without herbicide and averaged across years, when DPS was applied at 50 Mg/ha DPS, the abundance of annual broadleaf weeds decreased by 78 to 96%, and biomass by 82 to 93%, whereas with herbicide, the abundance decreased by 66 to 100%, and biomass by 80 to 100%, at St. Augustin and St. Hyacinthe, respectively, compared with the 0 Mg/ha DPS treatment. At St. Augustin, DPS applied at 50 Mg/ha without herbicide usually decreased the annual grass weed abundance and biomass. DPS had no obvious effect on the abundance and biomass of perennial weeds. DPS amendment alone or with herbicides suppressed mainly the annual broadleaf weeds, and, to a lower extent, the annual grass weeds.