Soil ManagementOrange Judd Company, 1914 - 311 páginas |
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Página 15
... plant food materials , but not in available forms , and which it must become the business of soil management to trans- form into available condition with sufficient rapidity to meet the need of heavy yields . 3. 15 INFLUENCE OF SOIL ...
... plant food materials , but not in available forms , and which it must become the business of soil management to trans- form into available condition with sufficient rapidity to meet the need of heavy yields . 3. 15 INFLUENCE OF SOIL ...
Página 16
... plant food materials grow , through the mutual in- teraction of a multitude of soil organisms , organic matter , moisture , air and the roots of crops , living and decaying , all of them oper- ating together to bring into solution the ...
... plant food materials grow , through the mutual in- teraction of a multitude of soil organisms , organic matter , moisture , air and the roots of crops , living and decaying , all of them oper- ating together to bring into solution the ...
Página 17
... plant food materials , over which organic matter may widely spread to consti- tute the feeding ground of those microscopic forms of life which turn its nitrogen and other plant food elements into forms avail- able to crops , and these ...
... plant food materials , over which organic matter may widely spread to consti- tute the feeding ground of those microscopic forms of life which turn its nitrogen and other plant food elements into forms avail- able to crops , and these ...
Página 18
... , soil air , total plant food and plant food materials soluble in water , contained in one cubic foot of average surface soil in the United States . occupy with the moisture and the air re- moved and 18 SOIL MANAGEMENT.
... , soil air , total plant food and plant food materials soluble in water , contained in one cubic foot of average surface soil in the United States . occupy with the moisture and the air re- moved and 18 SOIL MANAGEMENT.
Página 25
... plant food materials become available to crops until they are dissolved in the soil moisture , it is nevertheless fortunate that the great reservoir of plant food materials is filled with forms so difficultly soluble . Were this not so ...
... plant food materials become available to crops until they are dissolved in the soil moisture , it is nevertheless fortunate that the great reservoir of plant food materials is filled with forms so difficultly soluble . Were this not so ...
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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