Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 Cultivated Grains 307 the (lei)th of covering. If the seeds are covered deeply, it will grow to within about one or two inches of the sur- face before forming the permanent roots. It will thus be seen that deep covering of grains does not make the plants deep rooted, and only seems to reduce their chances of success (^ 32). The root system of cereals is composed altogether of slender, much branched roots. There are no heavy tap roots as in alfalfa.
Elementary principles of agriculture Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 Cultivated Grains 307 the (lei)th of covering. If the seeds are covered deeply, it will grow to within about one or two inches of the sur- face before forming the permanent roots. It will thus be seen that deep covering of grains does not make the plants deep rooted, and only seems to reduce their chances of success (^ 32). The root system of cereals is composed altogether of slender, much branched roots. There are no heavy tap roots as in alfalfa. (See Figs. 32 and 203). 442. The Best Varieties of Cereals are strains that have been continuously and carefully selected and thus acclimated in the climatic belt in Avhicli they are to be groA\Ti. High yielding varieties of corn and wheat from moist climates usually give lower yields in dry climates than acclimated native sorts; corn and other grains from dry climates, however, will sometimes out-yield native strains in moist cli- mates, if the change is not too radical. In many sections of the South, seed com is purchased from the North, with the idea that it will give earlier maturity and therefore larger yields. It does give earlier maturity, but it has long been established that im- proved native varieties give more bushels of rrt-m f^aa T?i'fr 1QC ^ ^'^- ^^0- Diagram of germinating com when torn. {Oee rig. l^h.) planted at different depths. 1, when planted 1 Ad'i TmnrnT7-<amonf '''''' '^'^'''P- 2. planted 3 inches deep; 3, planted •±^0. imprOVemeni .5 inches deep; r, seedling roots: a. permanent nf Vfln'pti^ic TMonrKr roots; and 6. first internode the length of which vx vcuic^lica. INCctllJ is determined by depth of covering of seed.
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