Soil ManagementOrange Judd Company, 1914 - 311 páginas |
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Página 34
... root hairs of crops place themselves to ap- propriate both the moisture and what it has dissolved . The internal soil surface of every field is , therefore , a pasture where plant food grows and upon which crops , through their roots ...
... root hairs of crops place themselves to ap- propriate both the moisture and what it has dissolved . The internal soil surface of every field is , therefore , a pasture where plant food grows and upon which crops , through their roots ...
Página 37
... roots may feed . If now each of these cubes is quartered , their surfaces will again be doubled , and we shall have a ... root hairs could place themselves to feed , would be 6,000 square feet , or one- seventh of an acre per cubic foot ...
... roots may feed . If now each of these cubes is quartered , their surfaces will again be doubled , and we shall have a ... root hairs could place themselves to feed , would be 6,000 square feet , or one- seventh of an acre per cubic foot ...
Página 44
... roots and the root hairs to advance between them , plac- ing themselves so as to absorb the moisture and plant food materials which surround and are contained within them . Upon the sur- faces of these compound grains the micro- scopic ...
... roots and the root hairs to advance between them , plac- ing themselves so as to absorb the moisture and plant food materials which surround and are contained within them . Upon the sur- faces of these compound grains the micro- scopic ...
Página 51
... root hairs of crops may draw their sup- ply . But a good loam soil presents six times this amount , or 270 square miles , while our finest clay soils carry thirty times as much , or more than 1,300 square miles per acre of field . With ...
... root hairs of crops may draw their sup- ply . But a good loam soil presents six times this amount , or 270 square miles , while our finest clay soils carry thirty times as much , or more than 1,300 square miles per acre of field . With ...
Página 53
... root hairs of the crops imbibe it by absorp- tion . This being true , it must be clear that those soils which can retain most water will also be able to retain most of the immedi- ately available plant food material . So , too , when ...
... root hairs of the crops imbibe it by absorp- tion . This being true , it must be clear that those soils which can retain most water will also be able to retain most of the immedi- ately available plant food material . So , too , when ...
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Términos y frases comunes
abundance agricultural amount of water available plant food become black marsh capillary action capillary rise carried cent compound grains corn cube cubic foot cultivation depth develop diameter drainage drained dry soil earth mulch effective essential plant food evaporation face feeding fertilizer finest clay soils furrows granules green manures ground growing growth humus important inches of water irrigation Japan large yields layer leaching less lime carbonate loam loss of water maintained nitrate nitric acid nitrification nitrogen organic matter peat phosphoric acid physical condition plant food elements plant food materials plant sap poor soils potash pound of dry pounds of water pounds per acre practice productive capacity rain rainfall rice root hairs root zone salts saturated sodium nitrate soil grains soil management soil moisture soil surface soluble plant food solution square miles stable manure subsoil surface four feet surface soil texture tion ture underdrainage water films wheat