First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 5
... determine its earning power , for the sale of animal products is simply. Plants are of first importance to agriculture , The production of animals and animal products is merely one way of marketing the crop. INTRODUCTORY 5.
... determine its earning power , for the sale of animal products is simply. Plants are of first importance to agriculture , The production of animals and animal products is merely one way of marketing the crop. INTRODUCTORY 5.
Página 8
... determine the sources of the ingredients found there . For the purpose of this study the corn , or maize , plant is chosen , as it is perhaps the most important of all plants to the American farmer . Before presenting the analysis it is ...
... determine the sources of the ingredients found there . For the purpose of this study the corn , or maize , plant is chosen , as it is perhaps the most important of all plants to the American farmer . Before presenting the analysis it is ...
Página 16
... determining the fertility of the land , and that more soils fail to produce good crops for lack of it than for any other cause . It seldom happens that the water supply is sufficient to grow the maximum crop of which the soil is capable ...
... determining the fertility of the land , and that more soils fail to produce good crops for lack of it than for any other cause . It seldom happens that the water supply is sufficient to grow the maximum crop of which the soil is capable ...
Página 32
... determine which elements are essential , plants were grown , either in specially pre- pared sand or by the " water - culture method , " in such a way that they were supplied with all the elements. 32 FIRST PRINCIPLES OF SOIL FERTILITY.
... determine which elements are essential , plants were grown , either in specially pre- pared sand or by the " water - culture method , " in such a way that they were supplied with all the elements. 32 FIRST PRINCIPLES OF SOIL FERTILITY.
Página 38
... determining what these essential elements are . Before proceeding to apply the knowledge thus gained , brief mention will be made of two or three ways in which plant food may be lost , other than by removal of the crop : First , by ...
... determining what these essential elements are . Before proceeding to apply the knowledge thus gained , brief mention will be made of two or three ways in which plant food may be lost , other than by removal of the crop : First , by ...
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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.