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Show PREPARE GROUND WITHJYNAMITE By Rowland Harwell of New Mexico Experiment Station In heavy adov0 soils, such as ro-autre ro-autre quite an excavation In order to secure pioper development of tho young root system, It hns been found advantageous to oxplodo smnll charges char-ges or a low grade slow acting dy namlto (20 per cent ammonia), nt a distance of from 18 Inches to 30 "inches "in-ches from the surface, thus forming a hole for the tree and at the samo time looicnlng tho soil to a greater extent, both In surface area and In depth, thnn Is posslblo when holes nro spaded. Tho charges must of necessity vnry with tho condition of the soil. Tho-o Is no "rulo of tumb" to bo applied In this enso. Tho resistance offered by tho soil measures tho quantity of djnnmlte necessary; as does )'it! depth at which It Is placed. In general, gen-eral, for the abovo mentioned depths the charges vary from ono quarter to ono half pound. A little experience and understanding of what constitutes consti-tutes n dynamited tree holo will solvo tho problem. A few simple experiments always icpay tno slight additional cost. An Ideal tree hole, strango to say, Isn't n holo after all. Should th. operator uso n chnrgo sufficiently strong to blow the earth entirely out from about th0 d namlto, ho might bo embarrassed by tho fact that there would bo llttlo dirt left at a convenient dlstnuco to ropiace nlioui tho tree. Further, thero would bo a decided waste of energy In raising the earth to scattering distance. Ouco tho surfneo gives way, the ox-pandlng ox-pandlng gases slip from beneath the soil particles and Join tho atmosphere whero spaco Is less contested. The Ideal hole Is produced by charging In such a manner as to raise tho surface sur-face soil to a height of four feet or such a matter and then let It fall back In place. This soil, when fnll lug back, will becomo raught at the surfaco of tho hole, and by giving it a few downward pushes with a spado a holo largo enough for the tree will result nnd plenty of looso earth for packing nbout the roots will bo at hand. In this manner a largo radius of disturbed or subsollcd earth will be produced. Tho method In somo Instances can competo In cost with spado holes, with the advantago of much more soil being loosened. As far ns is known, no harm results from tho fumes remaining In tho soil for sov-oral sov-oral hours after tho. holo is made nnd tho treo is planted. In general, tho cost will rango from six cents to twonty-soven cents por tree hole, for dynamite, fuso and caps. Tho labor cost also varies with tho soils from ono cent per hole to flvo cents. Tho holes for tho chargo aro put straight down, and aro 1 1-2 Inch or 2 inches in diameter. A bar may bo driven down and pulled. A pipe can bo driven, its coro of earth being ro-moved ro-moved several times before the desired de-sired depth is rcachod; or an earth auger can bo used for this purpose. Generally, the later method Is the best. In subsolllng or other purposes tho method is Identical, except th.it tho earth Is not lifted so high In tho air, and tho holes are so spaced tlmt all tho soil of a given area Is loos ened. This spacing vnrles from four feet, zigzag, to ten feet. Tho conditions condi-tions of tho soil determines this, tho heavier clay soils requiring tho closer clos-er spacing. Tho method Is oxpons-, Ivo, nnd only to bo used whero cheaper methods fall. Utah Farmer |