. Soil physics and management. Fig. 145.—Spike-tooih harrow. Fia. l-lt.—Spnng-tootii harrow. The spring-tooth harrow (Fig. 146) is used quite exteusivelvin r;.uJ-I°re the soU is in iatl«v poor a^dhere it is neoessarv to cultivate as ^ell as harrow. After a ram TILLAGE 333 this harrow will do more ciVutmit work in loosening the soil thanthe ordinary spike-tooth harrow, and for that reason is a«ed mostly

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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1917