Search results
Results From The WOW.Com Content Network
The United States loses almost 3 tons of topsoil per acre per year. [16] 1 inch (2.5 cm) of topsoil can take between 500 [17] and 1,000 years [18] to form naturally, making the rate of topsoil erosion a serious ecological concern. Based on 2014 trends, the world has about 60 years of topsoil left. [18] [19]
The sodium adsorption ratio (SAR) is an irrigation water quality parameter used in the management of sodium-affected soils.It is an indicator of the suitability of water for use in agricultural irrigation, as determined from the concentrations of the main alkaline and earth alkaline cations present in the water.
In US customary units, most units of volume exist both in a dry and a liquid version, with the same name, but different values: the dry hogshead, dry barrel, dry gallon, dry quart, dry pint, etc. The bushel and the peck are only used for dry goods. Imperial units of volume are the same for both dry and liquid goods. They have a different value ...
A short-necked recyclable beer-bottle with a rounded body; the word is a nickname for a person who is short and fat. It used to be 12 Imperial ounces [341 ml] (3/5 of an Imperial pint), like the Canadian "stumpy" beer bottles. It was rounded down to 340 ml when South Africa converted to the metric system in 1970.
The porosity of soils is critical in determining the infiltration capacity. Soils that have smaller pore sizes, such as clay, have lower infiltration capacity and slower infiltration rates than soils that have large pore sizes, such as sands.
Communal tap (standpost) for drinking water in Soweto, Johannesburg, South Africa. May 2005. Groundwater plays a key role in sustaining water supplies and livelihoods in sub-Saharan Africa especially due to its widespread availability, generally high quality, and intrinsic ability to buffer episodes of drought and increasing climate variability.
In 2018, South Africa produced 19.3 million tonnes of sugarcane (14th largest producer in the world), 12.5 million tonnes of maize (12th largest producer in the world) 1.9 million tons of grape (11th largest producer in the world), 1.7 million tons of orange (11th largest producer in the world) and 397 thousand tons of pear (7th largest producer in the world).
Opencast mining As of 2011, South Africa produces in excess of 255 million tonnes of coal and consumes almost three-quarters of that domestically. As of 2018, South Africa was the seventh largest producer and consumer of coal in the world. The industry, as of 2015, employs about 80,000 workers, or.5% of total employment, down from a peak in 1981 of 135,000 workers. The coal industry is South ...