First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 8
... called ele- ments . Between 70 and 80 of them are known . They are called elements because they are the simplest sub- stances known , and can not by any means yet 8 FIRST PRINCIPLES OF SOIL FERTILITY.
... called ele- ments . Between 70 and 80 of them are known . They are called elements because they are the simplest sub- stances known , and can not by any means yet 8 FIRST PRINCIPLES OF SOIL FERTILITY.
Página 9
... called compounds . While the number of elements is small there are many thousands of com- pounds . This is due to ... called the dry matter of the plant . The dry matter burns on being ignited and a very small amount of mineral matter ...
... called compounds . While the number of elements is small there are many thousands of com- pounds . This is due to ... called the dry matter of the plant . The dry matter burns on being ignited and a very small amount of mineral matter ...
Página 10
Alfred Vivian. mineral matter remains , which is called ash . The part that burned , and completely disappeared is known as organic matter . The organic matter is composed of four classes of compounds known as fat , crude fiber ...
Alfred Vivian. mineral matter remains , which is called ash . The part that burned , and completely disappeared is known as organic matter . The organic matter is composed of four classes of compounds known as fat , crude fiber ...
Página 13
Alfred Vivian. but is perforated by numerous small openings . These openings are called " stomata " ( little mouths ) , and it is through these that the water is exhaled . This power of transpiration continues during the life of the ...
Alfred Vivian. but is perforated by numerous small openings . These openings are called " stomata " ( little mouths ) , and it is through these that the water is exhaled . This power of transpiration continues during the life of the ...
Página 15
... called ) through the skin . Water is also necessary for the movement of food within the plant . The food materials absorbed by the roots , and that manufactured by the leaves can be trans- ported to the different parts of the plant ...
... called ) through the skin . Water is also necessary for the movement of food within the plant . The food materials absorbed by the roots , and that manufactured by the leaves can be trans- ported to the different parts of the plant ...
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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
Pasajes populares
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.