First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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... Vivian. Copyright 1009 by Thashett " But the gist 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 . ' " 3.
... Vivian. Copyright 1009 by Thashett " But the gist 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 . ' " 3.
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... Farm XIII . Losses in Manure XIV . Preservation of Manure XV . Applying Manure XVI . Barnyard Manure and the Maintenance of Fertility . XVII . Commercial Fertilizers - Nitrogen . XVIII . Potash and Phosphate Fertilizers XIX . Mixed ...
... Farm XIII . Losses in Manure XIV . Preservation of Manure XV . Applying Manure XVI . Barnyard Manure and the Maintenance of Fertility . XVII . Commercial Fertilizers - Nitrogen . XVIII . Potash and Phosphate Fertilizers XIX . Mixed ...
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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 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 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 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
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Página 225 - Furthermore, the mineral elements are relatively cheap, while the nitrogen is relatively expensive, and 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 1 - ... woods ; All silent is the earth and sky, Except with his own lonely moods The blackbird holds a colloquy. Over the broad hill creeps a beam, Like hope that gilds a good man's brow, And now ascends the nostril-stream Of stalwart horses come to plough.
Página 245 - 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.