Accession Number : ADA115426

Title :   Plant Growth and Management for Wastewater Treatment in Overland Flow Systems.

Descriptive Note : Special rept.,


Personal Author(s) : Palazzo,Antonio J

PDF Url : ADA115426

Report Date : Apr 1982

Pagination or Media Count : 30

Abstract : Domestic wastewater was applied over a four-year period at various rates to three overland flow test slopes to study forage grass growth and nutrient removal. The annual application rates of nitrogen and phosphorus ranged up to 2026 and 226 kg/ha, respectively. The forage grasses were harvested three times per season. Plant yields, composition and uptake of nutrients were determined. The results show that reed canarygrass, quackgrass and Kentucky bluegrass were the most persistent grasses on the slope over the four years. Perennial ryegrass was a good plant to include in seed mixtures because it became established rapidly. Tall fescue and orchardgrass persisted on the slope during the initial three years of the study and then declined after high rates of wastewater were applied during the third winter. On all wastewater-treated slopes the grasses appeared to be healthy and vigorous. The major limitations to plant growth were winter injury, the deposition of wastewater solids, the development of channels on the slopes, and the invasion of barnyardgrass, which crowded out more desirable perennial grasses. Plant yields ranged from 7.6 to 12.2 metric tons/ha and increased with increasing annual loading rates of nitrogen up to 1300 kg/ha. Yields declined at the highest loading rate of about 2000 kg/ha. Plant yields were more than three times higher than the normal hay yields in this area, but they were lower than those produced at an adjacent slow rate test site. The chemical composition of the hay was within the limits for normal plant growth, and the hay was of excellent quality. The average yield was worth $862/ha.

Descriptors :   *Sewage treatment, *Grasses, Waste water, Water flow, Land areas, Slope, Agronomy, Growth(Physiology), Yield, Nutrients, Nitrogen, Phosphorus, Removal

Subject Categories : Agronomy, Horticulture and Aquiculture
      Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE