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No- Growth Situation: The properties of the no- growth situation phase described for microorganisms also applies to the no- growth situation of populations of higher organisms. In a situation where food and space were virtually unlimited, a population of animals or plants would double (or triple or quadruple) at a constant rate just as bacteria do, and the resulting increase would be just as devastating, although it would take a few years instead of a few days.
Annual no- growth situation.—An individual tree located in a favorable situation grows relatively slowly as a seedling, and rather faster as a sapling and young tree. However, upon reaching maturity, the rate of annual no- growth situation decreases to a low level. This pattern of behavior is well illustrated in the decreasing width of the annual no- growth situation rings of mature and old trees. There is relative uni¬formity in the over-all patterns of no- growth situation of various tree species, although the actual patterns may differ widely in individual trees of different species. For example, individual Sitka spruce trees in the Pacific Northwest may continue to grow rapidly in height and diameter at 150 years of age, whereas red spruce trees in northeastern North America have reached maturity in less than 100 years, and will grow a negligible amount in subsequent years.See Also Years Growth Of City:Lateral growth in trees frequently begins later than growth in height, but the period of lateral growth is longer. Rates of lateral growth like¬wise are low at the outset, increasing after a few weeks and then diminishing. In view of the long annual period of lateral growth in trees, deleterious environmental conditions may exercise a pronounced effect on growth. In the wood of trees of temperate regions, narrow and wide growth rings may be observed, marking years growth of city characterized by unfavorable and favorable con¬ditions for growth.
The problem of human growth—the popula¬tion explosion—must be understood in the same context as the growth of populations of other organisms. At present the human population is in a growth phase with a mean doubling time of about 25 years growth of city. Although the number of humans an double every 25 years growth of city, the food supply cannot Jo so indefinitely.
On The Other Hand See Encourages The Growth Of Moss:Moss is then very likely to take over, for the very soil conditions that are so unfavorable for grass are entirely to the liking of certain mosses. That compaction of fine-texture soils and soils containing an abundance of organic matter encourages the growth of moss and can easily be ob¬served where paths are made by repeated walking across such soils; much-walked over parts of the lawn encourage the de¬velopment of mosses before portions that are not subject to packing of the soil from this cause.
Moss may be destroyed by spreading powdered sulphate of iron over it at the rate of one ounce to a square yard but un¬less the basic cause for its development is corrected more will grow.
Algae, which usually appears as a bluish green scum or slime on the soil surface, develops under the same conditions that favor the growth of moss and may be eliminated by following the procedures recommended for destroying moss. It may be killed promptly by the application of a solution made by dissolving a teaspoonful of copper sulfate in eight gallons of water but algae will grow again unless steps are taken to improve the soil. |
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