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Updated: June 7, 2025
The preventive measures consist in keeping the houses and runs clean. Air-slaked lime should be scattered over the runs every few weeks. The drinking places should be cleaned and disinfected daily. All possible precautions should be taken in order to prevent filth from getting into the drinking water.
On the other hand, we find very little hydrated lime on the market that has not had sufficient exposure to the air to become changed in some part to an air-slaked condition, or has had refuse mixed with it. Air-slaked lime is not worth as much per ton as the hydrate because it cannot correct as much soil acidity, and the percentage of the former cannot be determined by the buyer.
The percentages of air-slaked material in hydrated limes are widely variable, and no manufacturer can standardize his product on the market surely for the benefit of the farmer. In some instances the product is adulterated with refuse material in finely pulverized condition. Air-Slaked Lime. A pure limestone is a carbonate, and the chemical formula is CaCO3.
As soon as the young plants appear, sprinkle them with air-slaked lime. Transplant when three or four inches high, being very careful not to let the plants get tall and weak.
In making purchase for use of land the buyer cannot afford to make any appreciable difference in price in favor of air-slaked lime, as compared with a fine stone. Air-Slaking a Slow Process. Lime changes to an air-slaked condition slowly unless it has full exposure. Old heaps will remain in hydrate form for many years, excepting the outside coat, which excludes the air.
Common air-slaked lime is almost pure carbonate of lime, and hence comes nearer to the composition of marine shells than lime from bones, and, being much cheaper, would appear to be preferable. An able farmer told me that by using wood ashes liberally he could follow with cabbage the next season on the same piece.
Considering the circumstances under which this insect appears, usually in a very dry season, I hold that it is rather the product than the cause of disease, as with the bark louse on our apple-trees; as a remedy I advocate sprinkling the plants with air-slaked lime, watering, if possible, and a frequent and thorough stirring of the soil with the cultivator and hoe.
A by-product in the removal of magnesium from a magnesian limestone is an excellent material for correction of soil acidity, on account of its physical condition. Its exposure to the air causes much of the hydrate to change to an air-slaked form, and its value per ton lies somewhere between that of very finely pulverized limestone and hydrated lime. Magnesium.
The unstable nature of fresh burned and hydrated forms makes an exact statement of percentages impossible for goods not wholly fresh, but at least the purity of the original limestone can be judged. Equivalents. One ton of fresh burned lime, made from pure stone, is equivalent to 2640 pounds of the hydrate, and to 3570 pounds of pulverized limestone or of air-slaked lime.
At the first suggestion of a technical problem with which to wrestle, Jim thrust the Secretary's elusive one aside. He started for the dam site eagerly, and refused to think again that day of the shadow that haunted his work. In excavating for the abutments a thick stratum of shale had been exposed that air-slaked as fast as it was uncovered.
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