. Soil physics and management. 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^. Fig. 173.—Ridged cultivation with drilled corn. A verj undesirable method with nearly all soils. if the corn is drilled and not checked. This forms a very strongobjection to drilling corn. The ridge formed is sometimes six to
. Soil physics and management. 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^. Fig. 173.—Ridged cultivation with drilled corn. A verj undesirable method with nearly all soils. if the corn is drilled and not checked. This forms a very strongobjection to drilling corn. The ridge formed is sometimes six toeight inches high. The disk cultivator or the little diamond plow-are both used for ridging. The ideal cultivation is not absolutelylevel, but such as to have a slope of one to two inches between figure 172 and figure 173. QUESTIONS 1. What was Jetliro TuUs theory of plant nutrition? 2. Define tillage. 3. Why is loosening the soil necessary? 4. Give results obtained for plowing and not plowing. 5. What are the advantages of turning under vegetable matter? 6. Give advantages of killing weeds. 7. Give tillage for storing and conserving moisture. 8. Why is compacting necessary? 9. Give action of mold-board plow in turning soil. 10. What conditions are necessary for best pulverization? 11. WTiat is the advantage of the stubble plow? 12. What is the obje
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1917
