. Soil physics and management. ation 1888 1889 1890 1891 1892 1896 Average for years given 1. None—weeds kept down by scraping with a hoe * . . 2. Shallow—4 or 5 times 3. Deep—4 or 5 times 4. Shallow—roots 5. Shallow—roots pi-uned . 6. Scraped with how * 7. Scraped with hoe,* rootspruned f * No mulch produced. t A frame one foot square was placed over the hill of cor

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. Soil physics and management. ation 1888 1889 1890 1891 1892 1896 Average for years given 1. None—weeds kept down by scraping with a hoe * . . 2. Shallow—4 or 5 times 3. Deep—4 or 5 times 4. Shallow—roots 5. Shallow—roots pi-uned . 6. Scraped with how * 7. Scraped with hoe,* rootspruned f * No mulch produced. t A frame one foot square was placed over the hill of corn and a knife was run aroundthe outside 4 inches deep. The effect of cutting the corn roots is shown by comparing plots4 and 5, where a difference of bushels per acre is shown infavor of no root injury, and the difference is about the same whenplots 6 and 7 are compared. Level Cultivation.—Under practically all conditions of rainfalland soils almost level cultivation is most desirable. Eido-ed cultiva-. FiG. 172.—Level cultivation. 356 SOIL PHYSICS AND MANAGEMENT tion must necessarily be deep, and is always accompanied by rootinjury. In some alluvial bottom land ridging may be the annual morning glory or other troublesome weeds arethick deep cultivation may be advisable to cover them, especially ?i 1- i^s^^ffmm^^^^^^^^^^.f^

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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1917