First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 12
... moisture . The earth around the plant should first be covered with a piece of oil cloth or oiled paper to make sure that the water does not come from the soil . If the underside of a leaf is examined with a magnifying glass or mi ...
... moisture . The earth around the plant should first be covered with a piece of oil cloth or oiled paper to make sure that the water does not come from the soil . If the underside of a leaf is examined with a magnifying glass or mi ...
Página 13
... moisture which has collected on the inside . The one on the right has just been placed over the plant and is transparent during its growing period . As this quantity of corn can be raised on one - thirtieth of an acre , it follows that ...
... moisture which has collected on the inside . The one on the right has just been placed over the plant and is transparent during its growing period . As this quantity of corn can be raised on one - thirtieth of an acre , it follows that ...
Página 14
Alfred Vivian. water . These statements show clearly the necessity of carefully conserving the moisture of the soil , a point that can not be too strongly emphasized . King found in investigations made at Wisconsin that the amount of ...
Alfred Vivian. water . These statements show clearly the necessity of carefully conserving the moisture of the soil , a point that can not be too strongly emphasized . King found in investigations made at Wisconsin that the amount of ...
Página 15
... ground the proper amount of moisture , and that it is indepen- dent of the chemical composition of the soil , except as this composition affects its power to furnish the plant with ATMOSPHERE AS A SOURCE OF PLANT FOOD 15.
... ground the proper amount of moisture , and that it is indepen- dent of the chemical composition of the soil , except as this composition affects its power to furnish the plant with ATMOSPHERE AS A SOURCE OF PLANT FOOD 15.
Página 16
... moisture is the most important single factor in determining the fertility of the land , and that more soils fail to produce good crops for lack of it than for any other cause . It seldom happens that the water supply is sufficient to ...
... moisture is the most important single factor in determining the fertility of the land , and that more soils fail to produce good crops for lack of it than for any other cause . It seldom happens that the water supply is sufficient to ...
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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