First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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... Humus and Green - manuring 94 X. Rotation of Crops · 105 XI . Factors Affecting Value of Fresh Manure 113 XII . Amount and Value of Manure produced on Farm 127 XIII . Losses in Manure 137 XIV . Preservation of Manure 150 XV . Applying ...
... Humus and Green - manuring 94 X. Rotation of Crops · 105 XI . Factors Affecting Value of Fresh Manure 113 XII . Amount and Value of Manure produced on Farm 127 XIII . Losses in Manure 137 XIV . Preservation of Manure 150 XV . Applying ...
Página 52
... humus , and this increases the fertility of the land , both by being a source of plant food , and by increasing the water - retaining power . It will be shown later that humus is a very important factor in fertility . During the ...
... humus , and this increases the fertility of the land , both by being a source of plant food , and by increasing the water - retaining power . It will be shown later that humus is a very important factor in fertility . During the ...
Página 56
... humus or peaty soil is formed . Sedentary and Transported Soils . - Soils which have been. Lakes , ponds and swamps are gradually being filled by the movement of the soil from higher to lower levels Nature undisturbed returns all the ...
... humus or peaty soil is formed . Sedentary and Transported Soils . - Soils which have been. Lakes , ponds and swamps are gradually being filled by the movement of the soil from higher to lower levels Nature undisturbed returns all the ...
Página 59
... humus - making materials , which is unquestionably quite as important as the actual loss of the chemical elements of fertility . How to Prevent Exhaustion of the Soil .-- Although Nature's method of maintaining the fertility of the soil ...
... humus - making materials , which is unquestionably quite as important as the actual loss of the chemical elements of fertility . How to Prevent Exhaustion of the Soil .-- Although Nature's method of maintaining the fertility of the soil ...
Página 72
... humus content which may be badly puddled if fall plowed . Here , as everywhere in farming , good judgment is called for on the part of the farmer . Early Spring Plowing to Conserve Moisture.- Plowing the ground very early in the spring ...
... humus content which may be badly puddled if fall plowed . Here , as everywhere in farming , good judgment is called for on the part of the farmer . Early Spring Plowing to Conserve Moisture.- Plowing the ground very early in the spring ...
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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