. The chemistry of soils and fertilizers. Soils; Fertilizers. 62 SOILS AND FERTILIZERS f Silicate I Phosphate Calcium \ Chloride Sulphate Carbonate Potassium Sodium .. Magnesium â Iron The following reactions will explain some of the more elementary forms of combinations : CaO + SiO., = CaSiO, CaO + SO3 = CaSO^ SCaO + P^Oj =Ca3(P0,), K^O + SO3 = K,SO, CaO + SO3 = CaSO^ Na^O + SO3 = Na,SO, CaO + CO2 = CaCO. MgO + SO3 = MgSO^ When considered as the oxide, calcium may com- bine with any of the oxides of the acid-forming ele- ments, as indicated by the reactions, to form salts. Each of the compoun
. The chemistry of soils and fertilizers. Soils; Fertilizers. 62 SOILS AND FERTILIZERS f Silicate I Phosphate Calcium \ Chloride Sulphate Carbonate Potassium Sodium .. Magnesium â Iron The following reactions will explain some of the more elementary forms of combinations : CaO + SiO., = CaSiO, CaO + SO3 = CaSO^ SCaO + P^Oj =Ca3(P0,), K^O + SO3 = K,SO, CaO + SO3 = CaSO^ Na^O + SO3 = Na,SO, CaO + CO2 = CaCO. MgO + SO3 = MgSO^ When considered as the oxide, calcium may com- bine with any of the oxides of the acid-forming ele- ments, as indicated by the reactions, to form salts. Each of the compounds formed from the more common elements may have a separate value as plant food, hence it is important to consider the combina- tions of each element separately. ACID-FORMING ELEMENTS 70. Silicon.âThe element silicon makes up from a quarter to a third of the solid crust of the earth and next to ox}'gen is the most abundant element found in the soil. Silicon never occurs in the vSoil in the free state. It either combines with oxygen to form silica (SiO^), or with oxygen and some base-forming element or elements to form silicates. Silica and the various silicates are by far the most abundant com-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Snyder, Harry, 1867-1927. Easton, Pa. , The Chemical Publishing Co.
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