Biofloc systems were developed to improve environmental control over production. In places where water is scarce or land is expensive, more intensive forms of aquaculture must be practiced for cost-effective production. There are strong economic incentives for an aquaculture business to be more efficient with production inputs, especially the most costly (feed) and most limiting (water or land)...

the paper determined optimum farm plan for food security among smallholder farmers in imo state, nigeria. data were collected with structured and validated questionnaire from 180 smallholder crops farmers in imo state. data were analyzed using descriptive statistics (mean, frequency distribution and percentages), budgetary analysis and linear programming model. results show that the mean age of...

The objectives of the study were to provide quantitative information on the material benefits generated from urban farming in order to assess the contribution of this activity to the food security and nutrition of participating households and to explore the meaning of urban agriculture in the livelihood of participants. The study was conducted in five informal settlements of Atteridgeville, Pre...

In a recent Opinion paper, Wegner (Journal of Experimental Botany 65, 381–392, 2014) adapts a concept developed for water flow in animal tissues to propose a model, which can explain the loading of water into the root xylem against a difference in water potential (Ψ) between the xylem parenchyma cell (more negative Ψ) and the xylem vessel (less negative Ψ). In this model, the transport of water...

The agro-ecosystems of semi-arid and dry sub-humid SSA are inherently dynamic. At this point in time they are also experiencing a series of complex social–ecological changes that make their future even more uncertain. To ensure that development investments made today in the small-scale farming systems that dominate these regions make sense also in a long-term perspective they should benefit the...

Water was a key factor for organisation and production at sheep rearing estancias (ranches). Even though it attracted little attention by historians.The present work intends to survey how relevant water three authors who were deemed as essential that period: Hernández, Lemée, Zeballos Daireaux.They propose number of sourcing techniques devices the purpose farming, which required some investment...

Estimates are presented of the net daytime thermal loads, and associated drinking water requirements, experienced by fully haired and naked skinned hominids adopting quadrupedal and bipedal postures in open equatorial environments. Naked hominids could probably have tolerated higher environmental temperatures and levels of metabolic heat production, but this would have required the expenditure ...

In a recent Opinion paper, Wegner (Journal of Experimental Botany 65, 381-392, 2014) adapts a concept developed for water flow in animal tissues to propose a model, which can explain the loading of water into the root xylem against a difference in water potential (Ψ) between the xylem parenchyma cell (more negative Ψ) and the xylem vessel (less negative Ψ). In this model, the transport of water...

Urban farming, practiced by about 800 million people globally, has contributed significantly to food security and food safety. The practice has sustained livelihood of the urban and peri-urban low income dwellers in developing countries for many years. Its popularity among the urban low income is largely due to lack of formal jobs and as a means of adding up to household income. There is increa...