. Soil physics and management. ig. 156.—Three-shovel cultivator. The shovel cultivators (Fig. 156) vary in the number and sizeof the shovels used. There may be two large shovels on each gang,three medium, or four small ones. The depth to which they govaries directly with the size of the shovels. It is not unusual to ULLAGE 339 see cultivaiion done over lour indies (l((|) willi the ]ar<(o or rn(;(liiimsliovcl. There are two types ol cultivators with four or five smallshovels iji each gang—the eagle claw and the spring-tooth. IMicse])en(!trate the soil to a depth slightly more than two inches
. Soil physics and management. ig. 156.—Three-shovel cultivator. The shovel cultivators (Fig. 156) vary in the number and sizeof the shovels used. There may be two large shovels on each gang,three medium, or four small ones. The depth to which they govaries directly with the size of the shovels. It is not unusual to ULLAGE 339 see cultivaiion done over lour indies (l((|) willi the ]ar<(o or rn(;(liiimsliovcl. There are two types ol cultivators with four or five smallshovels iji each gang—the eagle claw and the spring-tooth. IMicse])en(!trate the soil to a depth slightly more than two inches. A formof the shovel plow is made hy replacing the inside; shovel with alittle diamond or har share plow hy which the soil is thrown upinto a high ridge along tlie corn row. The disk cultivators (Fig. 157) consist of three disks on eachside and may he used to good advantage where the hind weed orwild morning glory ahounds. As these cultivators are commonlyused the disks are set to run deep and corn-row ridges result. They. Fig. —Disk cultivator. Fig. —Surface or blade cultivatorwith leveler. may, however, be adjusted to Tun shallow and leave the soil com-paratively level. Blade cultivators (Fig. 158) consist of four blades, two toeach gang, from 1;^ to 18 inches long and two to three inches are placed at an angle such that there is a slight tendencyto move some soil toward tlie row, but most of it falls over the blade,leaving a loose mulch. This implement is very satisfactory forshallow cultivation, and may be so adjusted as to stir the soil to adejjth of three inches or more. Cultivation to this depth, however,is seldom advisable because of the injury to the roots. The bladescover the entire space between the rows, so there is very little chancefor weeds to escape. A ^-shaped blades are being used to someextent. The sweep is a modification of the blade cultivator. Each ofthe above is made in Ixjth one- and t\vo-row forms. Various imple-ments for u
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