First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 9
... and oxygen . What remains after expelling the water is called the dry matter of the plant . The dry matter burns on being ignited and a very small amount of mineral matter remains , which is called ash . The INTRODUCTORY 9.
... and oxygen . What remains after expelling the water is called the dry matter of the plant . The dry matter burns on being ignited and a very small amount of mineral matter remains , which is called ash . The INTRODUCTORY 9.
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 18
... mineral matter taken in through its roots to form carbohydrates , proteids and the other complex compounds of which the plant is composed . Carbonic Acid the Sole Source of Carbon . — It has been thoroughly demonstrated that the green ...
... mineral matter taken in through its roots to form carbohydrates , proteids and the other complex compounds of which the plant is composed . Carbonic Acid the Sole Source of Carbon . — It has been thoroughly demonstrated that the green ...
Página 21
... simple compounds called nitrates , which con- sist of nitric acid combined with one of the mineral elements of the soil . The majority of farm crops can use only that part of the nitrogen in the soil 21 Nitrogen as a Plant Food.
... simple compounds called nitrates , which con- sist of nitric acid combined with one of the mineral elements of the soil . The majority of farm crops can use only that part of the nitrogen in the soil 21 Nitrogen as a Plant Food.
Página 22
... the nitrogen changed into the form of nitrates . Nitrification . The soil must not be regarded as an inert mass of mineral matter and refuse of former plant growth . It is , in fact , an 22 FIRST PRINCIPLES OF SOIL FERTILITY.
... the nitrogen changed into the form of nitrates . Nitrification . The soil must not be regarded as an inert mass of mineral matter and refuse of former plant growth . It is , in fact , an 22 FIRST PRINCIPLES OF SOIL FERTILITY.
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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.