by Staff Writers
Monday, July 4, 2011
Urban Dairy Manure
We do forget that the urban landscape is terribly abused and neglected. I have addressed the same problems with agricultural lands, but in fairness, their problems are actually quite minor in most cases. A simple rest will do the most good. Just how do you rest urban lands?
That is the problem and adding fresh compost is a case of importing fresh soils to replace those diminished by poor husbandry. Of course, adding a charge of biochar will allow the plants to prosper, but that option is hardly available yet. They still need to rotate different plant regimes through the soils while topping up the nutrients. It is not going to happen and the simplest solution is just what is described here.
Perhaps the dairy industry needs to get serious about converting their manure into a composting operation on an industrial basis. We presently have the heavy equipment to move it all around.
Dairy manure goes urban
by Staff Writers
Research plots were split and planted with
grass and mixed ornamentals.
Composted dairy manure solids were applied along with random tillage/aeration
treatments. Credit:Photo by
Shawna Loper St. Augustine
When natural ecosystems are replaced by roads, homes, and commercial structures, soil is negatively impacted. Studies have shown that, among other issues, distressed urban soils are often significantly compacted, may have alkaline pH, and may contain low amounts of essential organic matter and nutrients. This altered soil is typically not conducive to healthy plant root growth and establishment, leading to challenges for urban landscapes and homegardens.
"The management of urban soils often requires a different approach than is applied to natural or agricultural soils, but some management practices that are commonly used in agricultural systems have the potential to improve the quality of urban soils", explained Amy L. Shober, corresponding author of a new report from the University of Florida's Institute of Food and Agricultural Science.
Shober, along with graduate student Shawna Loper and their colleagues, designed a study to determine if the addition of compost-with or without the application of shallow tillage or aeration-improves soil properties and plant growth in simulated new residential landscapes.
According to the report published in HortScience, the researchers established 24 mixed landscape plots designed to simulate new residential landscapes. Each plot was constructed using 10 cm of subsoil fill material over a compacted field soil and planted with
grass (Stenotaphrum secundatum) and mixed
ornamental plant species. St.
The scientists applied composted dairy manure solids as an organic soil amendment at a depth of 5 cm in combination with two mechanical soil treatments (tillage to 15 cm and plug aeration), then assessed soil physical and chemical properties, plant growth and quality, and plant tissue nutrient concentrations to determine the effects of the different treatments.
The data showed that applications of compost significantly reduced soil density and pH and increased soil organic matter, electrical conductivity, and concentrations of phosphorus and potassium. Growth was enhanced in all of the ornamentals (except one) when the plants were cultivated in soil amended with composted dairy manure solids. In most instances, plant tissue nitrogen and phosphorus concentrations were higher for plants grown in soils receiving compost.
"We found that composted dairy manure solids can improve soil physical and chemical properties in residential landscapes when sandy fill soils are used. Application of composted dairy manure solids can also enhance the establishment and improve the growth of selected ornamental landscape plants", Shober said. "However, topdressing with composted dairy manure solids enhanced plant growth and quality as much as incorporation of compost to a depth of 20 cm by tillage."
The results also showed that shallow tillage and aeration had little effect on soil properties or plant growth.
The study showed the benefits of compost additions only during the first year after planting; the authors noted that the increased growth and the subsequent health of plants resulting from applications of compost may also prevent future plant failure. They recommended that future studies be done to evaluate the long-term effects of compost addition after the plant establishment period.