 | Sir Humphry Davy, George Sinclair, John Russell Duke of Bedford - 1815 - 452 страници
...any other part of the soil must be in too great proportion ; and a soil is unproductive if it consist entirely of impalpable matters. Pure alumina or silica,...magnesia, are incapable of supporting healthy vegetation. No soil is fertile that contains as much as 19 parts out of 20 of any of the constituents that have... | |
 | 1816 - 442 страници
...penetrability ; but neither they nor any other part of the soil must be in too great proportion ; and a soills unproductive if it consists entirely of impalpable...Pure alumina or silica, pure carbonate of lime, or car- • bonate of magnesia, are incapable of supporting healthy vegetation. No .. ' No soil is fertile... | |
 | William Thomas Brande - 1821 - 806 страници
...any other part of the soil must be in too great proportion ; and a soil is unproductive if it consist entirely of impalpable matters. " Pure alumina or...magnesia, are incapable of supporting healthy vegetation. " No soil is fertile that contains as much as 19 parts out of 20 of any of the constituents that have... | |
 | John Claudius Loudon - 1822 - 1494 страници
...any other part of the soil must be in too great proportion ; and a soil is unproductive if it consist entirely of impalpable matters. " Pure alumina or...; and no soil is fertile that contains as much as ID parti out of 2O of any of these constituents. " It will be asked, are the- pure earths in the soil... | |
 | John Claudius Loudon - 1825 - 1250 страници
...too great proportion ; and a soil is unproductive if it consist entirely of impalpable matters. 1'ure alumina or silica, pure carbonate of lime, or carbonate...; and no soil is fertile that contains as much as 1 9 pans out of 20 of any of these constituents. 21 CO. A certain degree of friability от looseness... | |
 | John Claudius Loudon - 1826 - 1252 страници
...any other part of the soil must be in too great proportion ; and a soil is unproductive if it consist entirely of impalpable matters. Pure alumina or silica,...; and no soil is fertile that contains as much as 19 parts out of 20 of any of these constituents. 2100. A certain degree of friability or looseness... | |
 | John S. Skinner - 1827 - 434 страници
...any other part of the soil must be in too great proportion; and a soil is unproductive if it consist entirely of impalpable matters. Pure alumina or silica,...vegetation; and no soil is fertile that contains as much as 19 parts out of 20 of any of these constituents. A certain degree of friability or looseness of texture... | |
 | F. ACCUM - 1828 - 526 страници
...any other part of the soil must be in too great proportion ; and a soil is unproductive if it consist entirely of impalpable matters. Pure alumina or silica,...magnesia, are incapable of supporting healthy vegetation. No soil is fertile that contains as much as 19 parts out of 20 of any of the constituents that have... | |
 | John Claudius Loudon - 1831 - 1330 страници
...only give coherence, but likewise softness and penetrability ; but neither tlu у nor any other pnrt of the soil must be in too great proportion ; and...supporting healthy vegetation ; and no soil is fertile tliat contains as much as 19 parte out of SO of any of these constituents. 2150. A certain degree uf... | |
 | John Claudius Loudon - 1835 - 1326 страници
...nor any other part of the soil must be in too great proportion : and a soil is unproductive if ¡* consists entirely of impalpable matters. Pure alumina...incapable of supporting healthy vegetation ; and no sou Is fertile that contains as much as nineteen parts out of twenty of any of these constituents.... | |
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... with carbonate of lime. Vegetable or animal matters, when finely divided, not only give coherence, but likewise softness and penetrability ; but neither they nor any other part of the soil must be in too great proportion ; and a soil is unproductive... 
