First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 4
... soil is said to be exhausted . This exhaustion of the soil might have been prevented and the soils in many cases can be restored to their original fertility clude , among other things , some knowledge of such sciences as geology ...
... soil is said to be exhausted . This exhaustion of the soil might have been prevented and the soils in many cases can be restored to their original fertility clude , among other things , some knowledge of such sciences as geology ...
Página 6
... unnecessary to deal with the matter considered in the next paragraph . Exhaustion of the Soil . - It is a matter of common experience that continued cropping results in a loss of fertility 6 FIRST PRINCIPLES OF SOIL FERTILITY.
... unnecessary to deal with the matter considered in the next paragraph . Exhaustion of the Soil . - It is a matter of common experience that continued cropping results in a loss of fertility 6 FIRST PRINCIPLES OF SOIL FERTILITY.
Página 10
... soil , however . The analysis of the corn plant is given on page 11 these the element nitrogen . The ash contains the ele- ments potassium , phosphorus , calcium , magnesium , iron , sulphur , chlorine , sodium and silicon . The fol ...
... soil , however . The analysis of the corn plant is given on page 11 these the element nitrogen . The ash contains the ele- ments potassium , phosphorus , calcium , magnesium , iron , sulphur , chlorine , sodium and silicon . The fol ...
Página 12
... soil . If the underside of a leaf is examined with a magnifying glass or mi- croscope it will be found that the surface is not entire , 12 but is perforated by numerous small openings . These openings Atmosphere as a Source of Plant Food •
... soil . If the underside of a leaf is examined with a magnifying glass or mi- croscope it will be found that the surface is not entire , 12 but is perforated by numerous small openings . These openings Atmosphere as a Source of Plant Food •
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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