By C. W. Rose, W. Ashhurst and H. T. Flint (Auth.)
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Extra info for Agricultural Physics
Some rainfall may flow off the area for which the balance is being studied, and some water may enter by flowing into it from adjacent areas. Also some of the rain received will be evaporated back to the atmosphere. Thus the water-balance equation can be written down by considering the possible fate of the precipitation received (or irrigation water applied) on a certain area of ground in a certain time. The equation is concerned with a volume of soil contained by the imaginary surface which would be generated by a vertical line moving round the area of ground for which the precipitation is considered.
Climate in the layers of air and soil in which plants grow is found to depend strongly on the relative and absolute magnitudes of the various components in these two conservation equations, which provide a physical basis for understanding the infinite variety of microclimates Nature provides. 2 the atmosphere is traversed by a variety of radiation streams which affect meteorological conditions if they are absorbed. Figure 8 illustrates the various components of the day-time heat exchange to a similar scale to that used for night-time exchange (Fig.
But such molecular processes are so slow in action that some much more effective mechanism than molecular transport must be responsible for the efficient mixing in the lower regions of the earth's atmosphere, where both heat and mass transfer can take place at rates many orders of magnitude greater than would be possible with molecular processes alone. The reasons for this will now be given. LAMINAR AND TURBULENT FLOW It was the now well-known experiments of Osborne Reynolds the flow of water in pipes which first called scientific attention PHYSICAL ENVIRONMENT OF AGRICULTURE 47 to the two basically different forms in which fluid flow can occur.
Agricultural Physics by C. W. Rose, W. Ashhurst and H. T. Flint (Auth.)