First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
Dentro del libro
Resultados 1-5 de 38
Página 42
... valuable fertilizing ingredients which they contain . The following table gives the amount of nitrogen , phos- phoric acid and potash in 1,000 pounds of some of the important crops , the different materials being selected to show ...
... valuable fertilizing ingredients which they contain . The following table gives the amount of nitrogen , phos- phoric acid and potash in 1,000 pounds of some of the important crops , the different materials being selected to show ...
Página 77
... in great waste of this valuable element of fertility . Drainage Aerates and Warms the Soil . - Under- draining the field results in lowering the water - table to the level of the drain , the water flowing. DRAINAGE AND IRRIGATION 77.
... in great waste of this valuable element of fertility . Drainage Aerates and Warms the Soil . - Under- draining the field results in lowering the water - table to the level of the drain , the water flowing. DRAINAGE AND IRRIGATION 77.
Página 82
... valuable crops . Marshall P. Wilder when asked to name the three things most essential to successful strawberry culture is said to have replied : " First , plenty of water ; second , more water ; third , still more water . " At the ...
... valuable crops . Marshall P. Wilder when asked to name the three things most essential to successful strawberry culture is said to have replied : " First , plenty of water ; second , more water ; third , still more water . " At the ...
Página 96
... valuable in improving the physical con- dition of the soil . Sandy soils are made more com- pact by its presence and better able to supply the crop with moisture . Clay soils , on the other hand , are made more mellow by the addition of ...
... valuable in improving the physical con- dition of the soil . Sandy soils are made more com- pact by its presence and better able to supply the crop with moisture . Clay soils , on the other hand , are made more mellow by the addition of ...
Página 102
... valuable method of increasing the humus supply of the soil it is not unattended by danger . In a dry season , for instance , the growth of a crop to plow under may result in lowering the moisture con- tent of the soil to a point that is ...
... valuable method of increasing the humus supply of the soil it is not unattended by danger . In a dry season , for instance , the growth of a crop to plow under may result in lowering the moisture con- tent of the soil to a point that is ...
Otras ediciones - Ver todas
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.