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Updated: May 31, 2025
"And what was the actual effect of the nitrogen?" questioned Mr. Thornton. "How much did the wheat yield when they left out the nitrogen and applied all the other elements?" "Only fifteen bushels," was the reply. "Only fifteen bushels! Only two bushels increase for all the other elements, phosphorus, potassium, magnesium, and calcium, and I remember you said that sulfur also was applied.
"Your very level uplands that neither lose nor receive material from surface washing are very deficient in phosphorus and much poorer than ours in potassium and magnesium; and your undulating and steeply sloping lands are more or less broken, with many rock outcrops on the points and some impassable gullies, which as a rule compel the cultivation of the land in small irregular fields.
By this science you have learned beyond doubt that many of the commonest elements of the earth's crust exist also in other worlds, and, what is of great significance, that the materials most closely connected with living organisms on the earth, such as hydrogen, sodium, magnesium, and iron, are the very ones which are found most widely diffused among the stars.
The Renewal of Fertility In rational systems of general farming the supply of any element which is normally very abundant may be renewed from the subsoil by even the very slight erosion which occurs on all ordinary lands in humid sections. This statement applies to iron and potassium, and often to magnesium.
The ash is composed of the various salts necessary for health, containing potassium, chlorine, calcium, magnesium, iron, silicon and other elements. For the nourishment of the body we need water, protein, fat, carbohydrates and salts, so it will be seen that milk is really a complete food.
The purest magnesian limestone consists of a double carbonate of calcium and magnesium, called dolomite." "But I have heard that magnesian lime is bad for soils," said Mr. Thornton. "That is true," Percy replied, "and so is ordinary lime bad for soils.
This renders the situation more simple as any carbonate, hydrate or oxide of lime will accomplish these purposes. Composition. The first consideration is the actual content of calcium and magnesium. A guaranteed analysis is the only safe basis of purchase.
Limestones vary widely in composition from a nearly pure marble through the dolomitic limestones, containing varying amounts of magnesium, to the impure varieties, which contain also ferrous and manganous carbonates and siliceous compounds in variable proportions.
The older gray silt loam prairie, the most extensive soil of Southern Illinois, contains in two million pounds of soil: Potassium 24,940 pounds Magnesium 4,690 pounds Calcium 3,420 pounds Phosphorus 840 pounds These data represent averages involving hundreds of soil analyses, and they emphasize the fact that normal soils are rich in potassium and poor in phosphorus.
Specimens are easily obtainable which are nearly pure and leave on treatment with acid only a slight siliceous residue. For the purpose of gravimetric determination, phosphoric acid is usually precipitated from ammoniacal solutions in the form of magnesium ammonium phosphate which, on ignition, is converted into magnesium pyrophosphate.
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