Addresses Delivered at the Triennial Celebration ..., 第 18-23 卷1879 |
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第16页
... pounds per square foot as the weight on the roof and 60 pounds per square foot as the weight on the floor , we should ob- tain as the load that had been supported on each of the first six from 46,400 to 53.650 pounds , and as the load ...
... pounds per square foot as the weight on the roof and 60 pounds per square foot as the weight on the floor , we should ob- tain as the load that had been supported on each of the first six from 46,400 to 53.650 pounds , and as the load ...
第13页
... pounds potash , 125 pounds nitrogen . 100 bushels of corn contain 33 pounds phosphoric acid , 20 pounds potash , 96 pounds nitrogen . 1000 pounds of tobacco contain 7 pounds phosphoric acid , 54 pounds potash . The 480,000,000 bushels ...
... pounds potash , 125 pounds nitrogen . 100 bushels of corn contain 33 pounds phosphoric acid , 20 pounds potash , 96 pounds nitrogen . 1000 pounds of tobacco contain 7 pounds phosphoric acid , 54 pounds potash . The 480,000,000 bushels ...
第15页
... pounds potash , 1.5 pounds lime . 15 bushels of wheat ( per acre ) contain 9 pounds of phosphoric acid , 5.5 pounds of potash , 1.0 pounds of lime ; while tobacco is even more severe in its effects on the soil , producing sometimes 1500 ...
... pounds potash , 1.5 pounds lime . 15 bushels of wheat ( per acre ) contain 9 pounds of phosphoric acid , 5.5 pounds of potash , 1.0 pounds of lime ; while tobacco is even more severe in its effects on the soil , producing sometimes 1500 ...
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