By B.T. Kang, A.N. Atta-Krah, L. Reynolds
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Additional resources for Alley Farming (The Tropical Agriculturalist)
31 0. THOMAS, T. H. (1971). Plant growth regulators and crop production. S. q. , 89, 33-42. CHAPTER 3 THE VEGETATIVE PLANT We have seen in the previous chapter that the early growth of seedlings can be likened to earning compound interest and that this is termed exponential growth. We also saw the prodigious growth of one frond of duckweed (Lemna minor) if it maintains this exponential pattern. It is amusing to use the equations given to calculate how large an area one frond could cover in a year, or even how long it would take to cover the earth's surface.
Natural auxin is a growth regulator, one of many such chemicals which occur in plants. The general nature and types of these plant hormones will now be discussed. 44 Plant Physiology HORMONES Plant hormones are chemical messengers that play a major role in organising growth and development. They are present in plant tissues in very low concentrations but their effect is often immense and dramatic. The presence of hormones was suggested by observation of plant growth long before experiments at the turn of the century eventually proved their existence.
There is good evidence that the roots are not passive in water movement but pump water up the xylem under pressure. The simplest evidence supporting the pumping action of roots is the existence of root pressure. This can be demonstrated on a grand scale by felling trees and measuring the pressure necessary to prevent sap from exuding out of the cut stump. 8). Root pressures of 1 to 2 atmospheres have commonly been recorded and it has been suggested that they may abnormally reach as high as 7 to 8 atmospheres.