. Improving crop yields by the use of dynamite . being4 to 8 feet, with a charge of about one-fourth of a P/4 x 8-inchcartridge of 30 per cent, or 40 per cent, dynamite in each Kansas and other Western States, holes are spaced from 15 to30 feet apart and loaded with a charge of from one to one and ahalf 1 !4 X 8-inch cartridges of 1 5 per cent, or 25 per cent, dynamite,in each hole. The proper place to locate the charge so that it willshatter a maximum area of subsoil, is two to three feet below thesurface, if the hardpan is thin, and the holes are placed four to eightfeet apart. In th
. Improving crop yields by the use of dynamite . being4 to 8 feet, with a charge of about one-fourth of a P/4 x 8-inchcartridge of 30 per cent, or 40 per cent, dynamite in each Kansas and other Western States, holes are spaced from 15 to30 feet apart and loaded with a charge of from one to one and ahalf 1 !4 X 8-inch cartridges of 1 5 per cent, or 25 per cent, dynamite,in each hole. The proper place to locate the charge so that it willshatter a maximum area of subsoil, is two to three feet below thesurface, if the hardpan is thin, and the holes are placed four to eightfeet apart. In thick hardpan, with the holes 15 to 30 feet apart,the charge should be located about six inches above the bottom ofthe hardpan. In California, hardpan has been blasted very effectively andcheaply with 5 per cent, low powder. A slow-acting dynamitedoes better work than a quick one, because its effect is more spread-ing. The difference in the results of the use of slow explosives andof quick ones on hardpan is illustrated on pages 66, 68 and 70. 67. PREPARING THE LAND FOR CROPS The exact size of the charge, the proper spacing of the holes,and their depth, depend largely on the kind of subsoil to be broken,its thickness and distance below the surface. When the bore holes are 15 feet or more apart, it is best toexplode a number of charges simultaneously by means of electricity,but when the bore holes are closer it answers the purpose about aswell to explode the charges with fuse and blasting caps. Some years ago F. G. Moughon, of Walton County, Georgia,blasted a piece of land with charges of about onethird of a 11/4 x 8-inch cartridge of dynamite in bore holes, two and a half to threefeet deep, spaced eight and ten feet apart. This ground has pro-duced since then phenomenal crops of watermelons, averaging 50to 60 pounds each. J. H. Caldwell, of Spartanburg, S. C, ad-vocates holes two feet deep spaced four feet apart. He explodes ineach of these about one-fourth of a V/4 x 8-inch csur
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Keywords: ., bookcentury1900, bookdecade1910, bookidimp, booksubjectexplosives
