Soil ManagementOrange Judd Company, 1914 - 311 páginas |
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Página 16
... phosphoric acid , so that when the roots of crops spread themselves out over the extensive internal surface , carrying a rich growth of soluble plant food materials , they find themselves in an ample pasture of nutritious feed , and ...
... phosphoric acid , so that when the roots of crops spread themselves out over the extensive internal surface , carrying a rich growth of soluble plant food materials , they find themselves in an ample pasture of nutritious feed , and ...
Página 22
... Phosphoric Sulphuric acid acid tons tons 20 8.9 tons 7.0 tons tons tons 4.0 2.4 .6 These amounts constitute 2.68 per cent of the dry weight of the soil , and their aggre- gate volume is represented relatively by the fifth cube on the ...
... Phosphoric Sulphuric acid acid tons tons 20 8.9 tons 7.0 tons tons tons 4.0 2.4 .6 These amounts constitute 2.68 per cent of the dry weight of the soil , and their aggre- gate volume is represented relatively by the fifth cube on the ...
Página 23
... phosphoric acid ( P ) and one - eightieth is sulphuric acid ( S ) . But the effective root zone in any soil ad- equately underdrained and of the proper de- gree of openness is fully three to four feet in depth , and hence the roots of a ...
... phosphoric acid ( P ) and one - eightieth is sulphuric acid ( S ) . But the effective root zone in any soil ad- equately underdrained and of the proper de- gree of openness is fully three to four feet in depth , and hence the roots of a ...
Página 26
... Phosphoric Sulphuric Mg N Good soil , 663.5 2,292.0 766.6 71.61 acid , P. 202.6 1,116.0 acid , S Poor soil , 586.9 626.8 293.4 35.70 84.83 548.1 Number of crops of wheat required to remove the above amounts . Good soil , 22.7 Poor soil ...
... Phosphoric Sulphuric Mg N Good soil , 663.5 2,292.0 766.6 71.61 acid , P. 202.6 1,116.0 acid , S Poor soil , 586.9 626.8 293.4 35.70 84.83 548.1 Number of crops of wheat required to remove the above amounts . Good soil , 22.7 Poor soil ...
Página 28
... Phosphoric Sulphuric Potash K Ca Mg . Good soils , 264.8 1,016.4 348.3 N 82.0 acid , P acid , S 113.6 1,379.0 Poor soils , 182.4 395-4 177.4 30.2 Number of crops of wheat required to remove the 64.3 388.6 Good soils , 9.I Poor soils ...
... Phosphoric Sulphuric Potash K Ca Mg . Good soils , 264.8 1,016.4 348.3 N 82.0 acid , P acid , S 113.6 1,379.0 Poor soils , 182.4 395-4 177.4 30.2 Number of crops of wheat required to remove the 64.3 388.6 Good soils , 9.I Poor soils ...
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Términos y frases comunes
abundance amount of water available plant food become black marsh capacity of fields carried cent coarse sandy soil compound grains corn crumb structure cube cubic foot cultivation deep depth develop diameter dissolved drainage dry soil earth mulch effective essential plant food evaporation face feeding fertilizers finest clay soils furrows granules green manures growing growth humus important increase internal surface irrigation large yields leaching less lime carbonate loam loss of water magnesia maintained nitrate nitric acid nitrification nitrogen organic matter phosphoric acid physical condition plant food elements plant food materials plant sap poor soils potash pounds of water pounds per acre practice productive capacity rain rainfall root hairs root zone roots of crops salts saturated soil grains soil management soil moisture soil particles soil surface soluble plant food solution square square miles stable manure surface four feet surface soil tion underdrainage water films water-soluble plant food wheat