Soil ManagementOrange Judd Company, 1914 - 311 páginas |
Dentro del libro
Resultados 1-5 de 48
Página v
... nitrogen Necessary conditions for fertile soil 1578 25 ! 12 15 17 Relative volumes in foot of surface soil Amount of plant food carried by soils Amount of water soluble plant food in soils Source of soluble plant food Internal surface ...
... nitrogen Necessary conditions for fertile soil 1578 25 ! 12 15 17 Relative volumes in foot of surface soil Amount of plant food carried by soils Amount of water soluble plant food in soils Source of soluble plant food Internal surface ...
Página 11
... nitrogen is maintained in the soil today and has been through unnum- bered ages . For many years it has been known that green plants draw their main supply of carbon directly from the air in the form of carbon dioxide or carbonic acid ...
... nitrogen is maintained in the soil today and has been through unnum- bered ages . For many years it has been known that green plants draw their main supply of carbon directly from the air in the form of carbon dioxide or carbonic acid ...
Página 12
... nitrogen , has been made known to the agricultural world . The most careful observers and the most thoughtful ... nitrogen for the higher plants was the organic mat- ter of the soil , and this , too , 12 SOIL MANAGEMENT Study of source ...
... nitrogen , has been made known to the agricultural world . The most careful observers and the most thoughtful ... nitrogen for the higher plants was the organic mat- ter of the soil , and this , too , 12 SOIL MANAGEMENT Study of source ...
Página 13
... nitrogen . When , finally , the matter came under rigid investigation by men of science , there fol- lowed a battle extending over years , during which the opponents in the fray hurled against one another all the weight of ex ...
... nitrogen . When , finally , the matter came under rigid investigation by men of science , there fol- lowed a battle extending over years , during which the opponents in the fray hurled against one another all the weight of ex ...
Página 14
... nitrogen supply from the air itself . But in the many repetitions of experiments which were conducted , particularly among those which , it was held by opponents , did not sufficiently guard against sources of er- ror , there were found ...
... nitrogen supply from the air itself . But in the many repetitions of experiments which were conducted , particularly among those which , it was held by opponents , did not sufficiently guard against sources of er- ror , there were found ...
Otras ediciones - Ver todas
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