. Botany for agricultural students . Botany. no GERMINATION OF SEEDS: SEEDLINGS Grass type, both the stem of the epicotyl and the primary root system are usually permanent. In many seedlings of this type, the cotyledons are probably so much distorted in connection with food storage, that they could not function as leaves if raised to the light. Again, it is claimed that these seedlings can come up through harder ground by not having to raise their cotyledons. {Fig. 104.). Fig. 104. — Seedlings of the Pea, showing how the seedling develops and the effect of different depths of planting, p, plum
. Botany for agricultural students . Botany. no GERMINATION OF SEEDS: SEEDLINGS Grass type, both the stem of the epicotyl and the primary root system are usually permanent. In many seedlings of this type, the cotyledons are probably so much distorted in connection with food storage, that they could not function as leaves if raised to the light. Again, it is claimed that these seedlings can come up through harder ground by not having to raise their cotyledons. {Fig. 104.). Fig. 104. — Seedlings of the Pea, showing how the seedling develops and the effect of different depths of planting, p, plumule; a, stem portion of epicotyl; g, ground line; r, radicle. The seedling at the right is so deep in the soil that it is unable to push the plumule out of the ground. Size of Seedlings. — There is no feature in which seedhngs vary more than in size. This might be illustrated by placing the seedling of Timothy or Clover by the side of a Coconut seedling. In general, the size of the seedling corresponds to the size of the seed. The size of seedlings is reckoned with in our methods of planting different seeds. Thus seeds, like Corn and Beans, are planted several inches deep in the soil, while seeds, like those of Lettuce, Clover, and Timothy, are sown on the surface, and cov- ered only lightly if at all. In small seedlings there is not enough food to enable the plant to reach through thick layers of soil. Tests have shown that not many Clover seedlings get through the soil when the seeds are planted even 2 inches in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Martin, John N. (John Nathan), b. 1875. New York : John Wiley & Sons, Inc.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
