. Citrus fruit culture. Fruit-culture; Citrus fruits. — 12 — Careful studies of the root-systems of sweet-oranges have been made at the Pomona substation, where the trees have always received deep and thorough irrigation, the water having been allowed to run from forty-eight to seventy-two hours at a time. Deep irrigation was here followed by deep cultivation from the time the trees were planted, and this somewhat discouraged but did not remove the shallow-rooting tendency. The ten-year-old Washington Navel on sweet-seedling stock, illustrated in plate 5, fig. 1, had three of its heaviest late
. Citrus fruit culture. Fruit-culture; Citrus fruits. — 12 — Careful studies of the root-systems of sweet-oranges have been made at the Pomona substation, where the trees have always received deep and thorough irrigation, the water having been allowed to run from forty-eight to seventy-two hours at a time. Deep irrigation was here followed by deep cultivation from the time the trees were planted, and this somewhat discouraged but did not remove the shallow-rooting tendency. The ten-year-old Washington Navel on sweet-seedling stock, illustrated in plate 5, fig. 1, had three of its heaviest lateral roots, starting out six inches below the surface, severed by the plow, at a dis- tance of two feet from the tree and of ten inches below the surface. (a in plate 5.) At this point a secondary lateral (6) developed, and descended at an angle of about sixty degrees from the perpendicular, until it reached a depth of two feet, when it assumed an almost hori-. PLATE 4. Root and Stem of Sixteen-Year-Old Orange Tree on Light Sandy Soil. Has always been short of water. zontal position. As no fertilizers have ever been applied to the orchard there could have been no influence from that source which would cause the roots to come near the surface. The original tap-root had not pene- trated deeper than four feet ten inches (c in plate 5). The longest lateral had a total length of fourteen feet, with many turns, at no time going deeper than one foot. From the main laterals were numerous secondary laterals that penetrated from one to two feet, and from these numerous fibrous roots extended through the soil in all directions. To sum this up, the sweet-orange is a surface-growing stock which has few or no deeply-penetrating roots. Advantages of Pomelo Stock.—Nearly all the orange trees now bearing in Southern California are budded on sweet-orange stock, but the pomelo is rapidly taking its place. There is still some prejudice. Please note that these images are extracted from scanned
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcitrusf, bookyear1902
