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Whenever Growth Necessitates: Once started, mow whenever growth necessitates. With most grasses as soon as they are half to three quarters of an inch to one inch higher than established cutting height. This may mean once a week at times, but in periods of rapid growth twice-a-week attention is necessary, and when growth is slow more time may elapse beŽtween mowings. It pays to mow frequently and to take a little each time rather than a lot. Don't let the grass get so high before mowing that after cutting it looks yellowish or brownish. This is an invitation to crab grass; diseases and pests. If bad weather prevents mowing before the grass is conŽspicuously longer than proper, raise the cutting height a little at the first mowing and gradually bring it to normal at subseŽquent cuttings.
Lateral growth in trees frequently begins later than growth in height, but the period of lateral growth is longer. Rates of lateral growth likeŽwise 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 characterized by unfavorable and favorable conŽditions for growth.See Also Extend The Growth Period:In forestry the question of provenance (ie exactly where the seed comes from) is clearly of the greatest importance. The forester's object is to extend the growth period of his trees as far as he can without putting them in danger of frost damage. He has little room for manoeuvre, but if he can add even a week to the growing season by getting his seed from 160km (100 miles) farther south without the trees suffering, he may add a whole year's growth in 20 years.
Growth Phase. Three basic factors affect the growth phase of cell populations: (1) the number of organisms involvedthe more parent organŽisms present, the more offspring there can be. (2) During this period most of the organisms reproŽduce; few are barren. (3) The generation time is constantthat is, the time it takes for each organŽism to appear, mature, and reproduce is relatively constant throughout the growth period.
On The Other Hand See Growth Curve:The ordinate, y, is proportional to 8, the angle between OL and OA, and since y=l, when circle is the mean proportional between the length of the quadrant and the abscissa of the intersection of the curve with the axis of X. Hence any apparatus that will describe the quadratrix will enable us to determine T graphically. Evidently the curve 7 = sin w-1* is much more convenient for this purpose, since T is one of the ordinates of this curve when x equals zero; but this curve does not appear to have been used by the Greeks.
What had caused the sag in the growth curve? It was no single event, but a series of circumŽstancessome of which were brought on by the growth itself. Suddenly, in the words of Jerome Wiesner, special assistant to Pres. John F. KenŽnedy for science and technology, the chunk of the federal budget that was going to support science and technology "became visible." |
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