First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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... of the whole matter is this : That for an easy and economical method of maintaining the fertility of the soil there is nothing equal to the practice of dairy farming ་ ་ S 591 .v86 1909 Copyright 1908 by ORANGE JUDD COMPANY.
... of the whole matter is this : That for an easy and economical method of maintaining the fertility of the soil there is nothing equal to the practice of dairy farming ་ ་ S 591 .v86 1909 Copyright 1908 by ORANGE JUDD COMPANY.
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... Farm 127 XIII . Losses in Manure 137 XIV . Preservation of Manure 150 XV . Applying Manure . 165 XVI . Barnyard Manure and the Maintenance of Fertility . 173 XVII . Commercial Fertilizers - Nitrogen 185 XVIII . Potash and Phosphate ...
... Farm 127 XIII . Losses in Manure 137 XIV . Preservation of Manure 150 XV . Applying Manure . 165 XVI . Barnyard Manure and the Maintenance of Fertility . 173 XVII . Commercial Fertilizers - Nitrogen 185 XVIII . Potash and Phosphate ...
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Alfred Vivian. Running water is Nature's greatest sculptor . It carves out hills and valleys , and carries away the debris to form a soil in some other place CHAPTER I INTRODUCTORY Farming is a business , and the.
Alfred Vivian. Running water is Nature's greatest sculptor . It carves out hills and valleys , and carries away the debris to form a soil in some other place CHAPTER I INTRODUCTORY Farming is a business , and the.
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... farming neces- sitates a knowledge of the principles upon which the art of agriculture is founded ; for an ... farming , however , has so impoverished the soil , in some parts of our country , that many farms 3 CHAPTER PAGE I Introductory.
... farming neces- sitates a knowledge of the principles upon which the art of agriculture is founded ; for an ... farming , however , has so impoverished the soil , in some parts of our country , that many farms 3 CHAPTER PAGE I Introductory.
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... farming of the future , therefore , must be done by men of broad training which should in- An abandoned farm . Many farms have been abandoned because the soil is said to be exhausted . This exhaustion of the soil might have been ...
... farming of the future , therefore , must be done by men of broad training which should in- An abandoned farm . Many farms have been abandoned because the soil is said to be exhausted . This exhaustion of the soil might have been ...
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Términos y frases comunes
acid and potash acre agricultural ammonia amount of nitrogen amount of plant animals applied 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 solid soluble substances sufficient sulphate superphosphate supply surface tillage tion urine wheat yield
Pasajes populares
Página 187 - The production possible from a definite amount of plant -food can be secured only when the conditions are such as to permit its proper solution, distribution and retention by the soil. The fact that fertilizers may now be easily secured, and the ease of application, have encouraged a careless use, rather than a thoughtful expenditure, of an equivalent amount of money or energy in the proper preparation of the soil.
Página 221 - Furthermore, the mineral elements are relatively cheap, while the nitrogen is relatively expensive, and thus that the economical use of this expensive element, nitrogen, is dependent to a large degree upon the abundance of the mineral elements In the soil. It is therefore advocated that for all crops and for all soils that are in a good state of cultivation, a reasonable excess of phosphoric acid and potash...
Página 241 - One will seek to know what the different forms of plant-food are, what they do, from what sources they can be obtained, and how he can use them to best advantage. He will become to some extent an investigator, and will, of necessity, take a deeper interest in his work.
Página 225 - When such crops as corn, cabbage, grass, potatoes, etc., have a luxuriant, healthful growth, an abundance of potash in the soil is indicated ; also, when fleshy fruits of fine flavor and texture can be successfully grown. (e). When a soil produces good, early maturing crops of grain, with plump and heavy kernels, phosphoric acid will not generally be found deficient in the soil. Such general indications may often be most helpful, and crops should be studied carefully with these facts in mind.