Soil ManagementOrange Judd Company, 1914 - 311 páginas |
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Página 24
... WATER - SOLUBLE PLANT FOOD ELEMENTS IN SOIL We have tried to fix in our minds the very important fact that within the surface four feet of every well - managed field there are carried 24 SOIL MANAGEMENT.
... WATER - SOLUBLE PLANT FOOD ELEMENTS IN SOIL We have tried to fix in our minds the very important fact that within the surface four feet of every well - managed field there are carried 24 SOIL MANAGEMENT.
Página 33
... water - dissolved plant food elements , which are the direct source of the plant food derived from the soil , come from two ulti- mate sources , ( 1 ) the mineral portion of the dry soil itself , and ( 2 ) nitrogen from the soil - air fixed ...
... water - dissolved plant food elements , which are the direct source of the plant food derived from the soil , come from two ulti- mate sources , ( 1 ) the mineral portion of the dry soil itself , and ( 2 ) nitrogen from the soil - air fixed ...
Página 69
... fix it deeply in the soil in their tubercle and root growth ; which includes the grasses hav- ing dense root systems , tending to both ... water . The cereal , vegetable , fiber and sugar crops ex- ert 69 PRINCIPLES GOVERNING PRODUCTIVITY.
... fix it deeply in the soil in their tubercle and root growth ; which includes the grasses hav- ing dense root systems , tending to both ... water . The cereal , vegetable , fiber and sugar crops ex- ert 69 PRINCIPLES GOVERNING PRODUCTIVITY.
Página 86
... fixed water would thereby be greatly increased , but the amount of water available to crops might , in some soils , be reduced nearly to zero ; and in a full understanding of these facts is to be found the explanation of the important ...
... fixed water would thereby be greatly increased , but the amount of water available to crops might , in some soils , be reduced nearly to zero ; and in a full understanding of these facts is to be found the explanation of the important ...
Página 88
... water will be sheared off these films by grav- ity more or less rapidly ; down to a less thickness the films may be thinned by sur- face tension and capillarity ; beyond this limit we have the fixed water which in all highly fertile ...
... water will be sheared off these films by grav- ity more or less rapidly ; down to a less thickness the films may be thinned by sur- face tension and capillarity ; beyond this limit we have the fixed water which in all highly fertile ...
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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