First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 13
... ground through the roots . Very large quantities of water are used in this way . Amount of Water Required by Crops . -European experi- ments have shown that approximately 300 pounds of water Experiment to show that water is given off ...
... ground through the roots . Very large quantities of water are used in this way . Amount of Water Required by Crops . -European experi- ments have shown that approximately 300 pounds of water Experiment to show that water is given off ...
Página 15
... ground , and enable it to enter the plant , as will be noted later . It is needed to give stiffness or rigidity to the more succulent parts of the plant . This fact is shown by the drooping or wilting of plants during the hot hours of ...
... ground , and enable it to enter the plant , as will be noted later . It is needed to give stiffness or rigidity to the more succulent parts of the plant . This fact is shown by the drooping or wilting of plants during the hot hours of ...
Página 30
... ground , ad- verse weather conditions , acidity of the soil , etc. , and the farmer should assure himself that the soil con- ditions are as favorable as possible before he attempts inoculation . Other Ways in which Nitrogen is Fixed ...
... ground , ad- verse weather conditions , acidity of the soil , etc. , and the farmer should assure himself that the soil con- ditions are as favorable as possible before he attempts inoculation . Other Ways in which Nitrogen is Fixed ...
Página 41
... ground , and not because they are any more essential to vegetation . Occasionally soils are found that are actually deficient in lime , but in most cases lime is present in sufficient abundance for the growth of the plant . In this ...
... ground , and not because they are any more essential to vegetation . Occasionally soils are found that are actually deficient in lime , but in most cases lime is present in sufficient abundance for the growth of the plant . In this ...
Página 43
... ground . The next table gives the amounts of nitrogen , phosphoric acid and potash removed from an acre by a few of the common crops . ( Adapted from Van Slyke . ) AMOUNT OF FERTILITY REMOVED FROM AN ACRE KIND OF CROP YIELD Corn , grain ...
... ground . The next table gives the amounts of nitrogen , phosphoric acid and potash removed from an acre by a few of the common crops . ( Adapted from Van Slyke . ) AMOUNT OF FERTILITY REMOVED FROM AN ACRE KIND OF CROP YIELD Corn , grain ...
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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.