. Better fruit. Fruit-culture. FicvRr. 7. Cross section of stem of the Redwood iSeqiioia sempervirens. End.) wood or water-carrying tissue, as illus- trated in Figure 8, is composed of water ducts or cells. The wood laid down in the later summer is much more dense, as shown at "A," while the early summer wood is more por- ous and open, as we see at "; This is partly ex- plained by the fact that the water demands upon the tree aie greater in (he spring in proportion to the w a t e r-c a r r\i n g tissues present, tlian later in the summer. Tlie wood of the horticultural va
. Better fruit. Fruit-culture. FicvRr. 7. Cross section of stem of the Redwood iSeqiioia sempervirens. End.) wood or water-carrying tissue, as illus- trated in Figure 8, is composed of water ducts or cells. The wood laid down in the later summer is much more dense, as shown at "A," while the early summer wood is more por- ous and open, as we see at "; This is partly ex- plained by the fact that the water demands upon the tree aie greater in (he spring in proportion to the w a t e r-c a r r\i n g tissues present, tlian later in the summer. Tlie wood of the horticultural varieties, as the walnut (l'"igure 9) or the cherr\ (Figure 10), shows the difference in spring and late sunnner wood a little less conspicu- ously than Figure 8. If we follow the ascent of the water up the stem, the two points of destina- FiGURE 8. Magnified section of wood of the Pitch Pine il'inus resinasa. Ait.) "A," late summer wood: "; early sunnner wood. leaves. Only in so far as water ab- soriJtion from the root and water transfer through the stem is in nor- mal condition can the young buds far up on the twigs open or ijcrforni their work. In the leaf we tind the source of the majority of all the food which the plant produces and which enaldes the tree to grow or produce fruit. A very small proportion of the woody tissues or of fruit tissues are due to the so-called "foods" of the soil, but the large per cent is derived from true foods laid down in the leaves. This makes clear the great injury to an orchard resulting from any factor which reduces the leaf area of the tree beyond certain safe limits. If we cut across a leaf and then look at the exposed edge much magnified, we see something like the diagram of Figure 11. The green coloring of plants is particularly abun- dant in the leaf, and is locafeil espe- cialh- in the upper portions of the leaf, which are marked "; On the under surface of the leaf will be seen li
Size: 1583px × 1579px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcollect, bookcollectionbiodiversity, booksubjectfruitculture
