Soil ManagementOrange Judd Company, 1914 - 311 páginas |
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Página vii
... humus on water content of soils Too large soil surface may render plant food un- available Thorough granulation conserves plant food Porosity of soil which is not due to structure 182 184 -------- 184 186 CHAPTER VIII DEVELOPMENT and ...
... humus on water content of soils Too large soil surface may render plant food un- available Thorough granulation conserves plant food Porosity of soil which is not due to structure 182 184 -------- 184 186 CHAPTER VIII DEVELOPMENT and ...
Página 68
... humus and organic matter . This organic matter is of first im- portance from the standpoint of developing immediately available plant food , but it has the highest value also in developing and maintaining the important physical charac ...
... humus and organic matter . This organic matter is of first im- portance from the standpoint of developing immediately available plant food , but it has the highest value also in developing and maintaining the important physical charac ...
Página 119
... humus , and where the leaching from every rain brought down added food . It was found also that in the surface 6 inches , and below , to a depth of 1 foot , the root devel- opment was markedly stronger than it was under the cultivation ...
... humus , and where the leaching from every rain brought down added food . It was found also that in the surface 6 inches , and below , to a depth of 1 foot , the root devel- opment was markedly stronger than it was under the cultivation ...
Página 121
... alkali " of the west , which everywhere has the tend- ency to dissolve humus and puddle the soil . In this impaired condition a higher per cent of the soil moisture becomes unavailable to the crop , 121 SOIL MOISTURE AND PLANT FEEDING.
... alkali " of the west , which everywhere has the tend- ency to dissolve humus and puddle the soil . In this impaired condition a higher per cent of the soil moisture becomes unavailable to the crop , 121 SOIL MOISTURE AND PLANT FEEDING.
Página 158
... humus the nitrogen food of crops takes first rank . In the decomposition of humus by bacteria in the soil nitric acid is formed , just as vinegar is the final product in the fer- mentation of sugar by yeast and the mother of vinegar ...
... humus the nitrogen food of crops takes first rank . In the decomposition of humus by bacteria in the soil nitric acid is formed , just as vinegar is the final product in the fer- mentation of sugar by yeast and the mother of vinegar ...
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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