The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 289
... percent , of calcium 3.6 percent , of potassi- um 2.6 percent , and of magnesium 2.1 percent . Thus , when phosphorus is removed from the soil by crops , it must be replaced artificially by the addi- tion of phosphate fertilizers ...
... percent , of calcium 3.6 percent , of potassi- um 2.6 percent , and of magnesium 2.1 percent . Thus , when phosphorus is removed from the soil by crops , it must be replaced artificially by the addi- tion of phosphate fertilizers ...
Page 633
... percent and that of hydroelectricity only about 2 percent . There are long - term plans for building a giant nuclear - power station in northern Poland . By the early 1970s natural gas had largely replaced manufactured gas . Crude oil ...
... percent and that of hydroelectricity only about 2 percent . There are long - term plans for building a giant nuclear - power station in northern Poland . By the early 1970s natural gas had largely replaced manufactured gas . Crude oil ...
Page 844
... percent of a sam- ple studied have fewer and 23 percent have more than 46 chromosomes , the standard human number . AUSTRALOID AND OCEANIC PEOPLES Australoids : The Tasmanians and Australian Aborig- ines . At the time of European ...
... percent of a sam- ple studied have fewer and 23 percent have more than 46 chromosomes , the standard human number . AUSTRALOID AND OCEANIC PEOPLES Australoids : The Tasmanians and Australian Aborig- ines . At the time of European ...
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