Biomass, Nitrogen Uptake and Content of Depends on Strength of Swine Lagoon Water.

Studies focusing on manipulation of growth conditions for duckweed to promote biomass for crop nutrient supply, are scarce. The effects of swine lagoon water (SLW) concentration and its replenishment and harvest regimes on selected properties of were investigated. Dry matter and average growth rate of were not affected by SLW replenishment periods, whereas the properties decreased with increasing concentration of SLW.

Decomposition of Wolffia arrhiza residues rapidly increases mineral nitrogen and decreases extractable phosphorus in acidic soils.

While nutrient loads from anthropogenic sources upset aquatic ecosystem balance, Wolffia arrhiza (duckweed) has capacity to purge nutrient-rich water if continuously harvested. The nutrients accumulated in biomass have potential as soil fertility amendments. The objective of this study was to determine changes in release of nitrogen (N) and phosphorus (P), and the fate of P in soils after duckweed biomass amendment.

Sustainable income-generating projects for HIV-affected households in Zimbabwe: evidence from two high-density suburbs.

An estimated 25% of the adults in urban areas of Zimbabwe are living as HIV-positive. In HIV-affected households the need for income increases with the demand for medicines, food and funeral costs. One way to mitigate this effect of the epidemic is by expanding micro enterprises that can enhance the livelihoods of urban households affected by HIV.