First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
Dentro del libro
Resultados 1-5 de 48
Página 8
... removed from the soil when the crop was harvested . It is not possible to explain the rapid decrease in fertility on any other basis ; for it can not be ascribed to any changes in climatic conditions . The change in the physical ...
... removed from the soil when the crop was harvested . It is not possible to explain the rapid decrease in fertility on any other basis ; for it can not be ascribed to any changes in climatic conditions . The change in the physical ...
Página 15
... removed by transpiration of water through the leaves , just as it is removed from the human body by the transpiration ( perspiration so - called ) through the skin . Water is also necessary for the movement of food within the plant ...
... removed by transpiration of water through the leaves , just as it is removed from the human body by the transpiration ( perspiration so - called ) through the skin . Water is also necessary for the movement of food within the plant ...
Página 25
... removed by the vegetation , while the growth of cereals resulted in a loss of nitro- gen . Other experimenters also arrived at the con- clusion that clover has the power of procuring nitrogen from some unknown source . Farmers had known ...
... removed by the vegetation , while the growth of cereals resulted in a loss of nitro- gen . Other experimenters also arrived at the con- clusion that clover has the power of procuring nitrogen from some unknown source . Farmers had known ...
Página 31
... removing it . Later writers , however , preeminent among whom was Liebig , proved that the ash ingredients are necessary to the plant . A very simple experiment was sufficient to show that at least some of the mineral matter was ...
... removing it . Later writers , however , preeminent among whom was Liebig , proved that the ash ingredients are necessary to the plant . A very simple experiment was sufficient to show that at least some of the mineral matter was ...
Página 37
... another . Potash is thought to be neces- sary to the conversion of starch into sugar and , con- sequently , to its removal from the leaves to other parts of the plant . As starch itself is insoluble , SOIL AS A SOURCE OF PLANT FOOD 37.
... another . Potash is thought to be neces- sary to the conversion of starch into sugar and , con- sequently , to its removal from the leaves to other parts of the plant . As starch itself is insoluble , SOIL AS A SOURCE OF PLANT FOOD 37.
Otras ediciones - Ver todas
Términos y frases comunes
acid and potash acre agricultural ammonia amount of nitrogen amount of plant animals applied average bacteria barn barnyard manure bedding carbonic acid clay clover commercial fertilizers complete fertilizers composition compounds condition corn crop decay deep stall denitrification drainage dry matter elements of plant Experiment Station fact farm farmer feeding fertilizing constituents fertilizing materials fertilizing value field grain green manuring ground grown hot fermentation humus important inches increase ingredients kainite land leaching legumes leguminous lime liquid excrement loss of nitrogen lysimeters manure produced materials ments method mineral matter mixed moisture necessary nitrate of soda nitrification nitrifying bacteria nitro nitrogen nure obtained organic matter oxygen phoric acid phos phosphate phosphoric acid plant food plant growth plots plowed pounds practically present rains ration removed rock roots rotation shown soil soil contains soluble substances sufficient sulphate superphosphate supply surface tillage tion urine wheat yield