We compared the capacity of composts made from three different sources of organic wastes （horse manure and bedding, mink farm wastes, municipal solid waste （MSW） and sewage sludge）, and clarifier solids from a che...We compared the capacity of composts made from three different sources of organic wastes （horse manure and bedding, mink farm wastes, municipal solid waste （MSW） and sewage sludge）, and clarifier solids from a chemo-thermomechanical pulp mill, to enhance the growth of tomato seedlings grown in potting soil with little organic matter. Germination and seedling emergence of tomatoes, cress or radish were tested to assess phytotoxicity of the four amendments. Mink farm compost and horse manurecompost stimulated root and shoot growth of tomato seedlings, but MSW compost and pulp mill solids were strongly inhibitory. MSW compost and non-amended potting soil also inhibited seedling emergence and pulp mill solids produced stunting and deformities in radish and cress seedlings. Both toxic constituents and nutrient imbalances may be responsible for the growth-inhibiting effects of these amendments. Application of pulp mill solids to agricultural soil without composting may lead to deleterious effects on vegetable crops.展开更多
文摘We compared the capacity of composts made from three different sources of organic wastes （horse manure and bedding, mink farm wastes, municipal solid waste （MSW） and sewage sludge）, and clarifier solids from a chemo-thermomechanical pulp mill, to enhance the growth of tomato seedlings grown in potting soil with little organic matter. Germination and seedling emergence of tomatoes, cress or radish were tested to assess phytotoxicity of the four amendments. Mink farm compost and horse manurecompost stimulated root and shoot growth of tomato seedlings, but MSW compost and pulp mill solids were strongly inhibitory. MSW compost and non-amended potting soil also inhibited seedling emergence and pulp mill solids produced stunting and deformities in radish and cress seedlings. Both toxic constituents and nutrient imbalances may be responsible for the growth-inhibiting effects of these amendments. Application of pulp mill solids to agricultural soil without composting may lead to deleterious effects on vegetable crops.
