. The corn crops: a discussion of maize, kafirs, and sorghums as grown in the United States and Canada. Corn; Kafir corn; Sorghum. 40 CORN CROPS ever, when the weather is very hot or when soil moisture is low, the cells lose water enough so they are no longer turgid, and the leaf then becomes limp and rolls up. In the same way, all cells of the plant may be more or less turgid, aiding in giving rigidity to the plant body. 30. Tension. â If a section a few inches long of the stem of green corn be taken and the outer peripheral tissue be removed from the pith, the pith will at once expand in len
. The corn crops: a discussion of maize, kafirs, and sorghums as grown in the United States and Canada. Corn; Kafir corn; Sorghum. 40 CORN CROPS ever, when the weather is very hot or when soil moisture is low, the cells lose water enough so they are no longer turgid, and the leaf then becomes limp and rolls up. In the same way, all cells of the plant may be more or less turgid, aiding in giving rigidity to the plant body. 30. Tension. â If a section a few inches long of the stem of green corn be taken and the outer peripheral tissue be removed from the pith, the pith will at once expand in length and some force will be required to restore it to normal length. It will thus be seen that there is a natu- ral tension at all times between the outer cortex and the pith. This tension adds to the rigidity of the stem. 31. Mechanical tissue. â The supporting framework is made up of woody and fibrous tissues in the outer part and the nodes of the stem and in the midribs and veins of the leaves. These are mostly comprised of fibers (scleren- chyma or bast) of great tensile strength. Quoting from Strasburger, " the sus- taining strength of sclerenchymatous fibers is, within the limits of their elas- FiG. 15. âIllustrat- HQUy jn general equal to the best mg resistance to , . bending when the wrought iron, or hammered steel, supporting tissue is T^g fibers are bound together, giving on the outside of ^ i , ⢠i i the stem, as in corn, a strong elastic body. One side must be The location of the framework on the shortened and the , . , ,, ,, ⢠,â , , e other stretched. outside, rather than m the center, oi the stem adds to the rigidity. For example, if an elastic rod be bent (Fig. 15), the inner side is shortened and the outer lengthened. If a supporting skeleton be placed in the center of this rod, then the rod is flexible and considerable bending would be possible without much resistance from the center; but if the sup-. Please note that these images are extracted f
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Keywords: ., bo, bookcentury1900, bookdecade1920, booksubjectcorn, bookyear1920
