Corn; growing, judging, breeding, feeding, marketing; for the farmer and student of agriculture, a text-book for agricultural colleges and high schools . peeling off the cortex, which lays bare the attachment. The central cylinder consists for the most part of tubes which areof use in carrying the plant food upward into the stem and leaves. CONDITIONS AFFECTING ROOT GROWTH. The factorsaffecting root growth are the factors which affect the yield of the crop. (i) In order that the younger and more tender rootlets maypush through the soil, its texture must be quite fine. A root willnot cross a la
Corn; growing, judging, breeding, feeding, marketing; for the farmer and student of agriculture, a text-book for agricultural colleges and high schools . peeling off the cortex, which lays bare the attachment. The central cylinder consists for the most part of tubes which areof use in carrying the plant food upward into the stem and leaves. CONDITIONS AFFECTING ROOT GROWTH. The factorsaffecting root growth are the factors which affect the yield of the crop. (i) In order that the younger and more tender rootlets maypush through the soil, its texture must be quite fine. A root willnot cross a large interspace between lumps of earth. (2) Com roots draw almost entirely upon the capillary water ofthe soil. In case of extreme drought they use the hydroscopic mois-ture. Very little, if any of the grazity water, that which is drainedfrom the soil in tiling, is utilized by the plant. (3) Roots avoid a cold soil and if the ground is of a low tem-perature will feed near the surface. (4) The entrance of oxygen into the soil is necessary to insurethe spread of root growth. (5) Roots seek and require the presence of plant food in the soil. 4S (Courtesy Percival) Fig. 9. 1. Young root of a pea. h Root-hairs of the piliferous layer; c root-cap.(Twice natural size.) 2. Transverse section through a young root of a pea near h in 1. h Rooi-hairs; c cortex; p piliferous layer; e endodermis; n pericycle; w woodstrand; x its protoxylem; b bast strand. (Enlarged 48 diameters.) Form of stem STALK.—Structure of Stem. The stem varies in height from i8inches to 24 feet, according to variety and conditions influencinggrowth, as climate and soil. It is made up of a series of sectionsknown as intcrnodcs, which vary in length from a few inches at thebase to more than a foot at the top. They are separated from eachother by short, thick joints or nodes. The length of internodes is lessat the base for the purpose of strengthening the stalk. Being longerat the upper end, the stalk has more ch
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Keywords: ., bo, bookcentury1900, bookdecade1900, booksubjectcorn, bookyear1908
