Download Agricultural Physics by C. W. Rose, W. Ashhurst and H. T. Flint (Auth.) PDF

By C. W. Rose, W. Ashhurst and H. T. Flint (Auth.)

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Figure 17 represents PHYSICAL ENVIRONMENT OF AGRICULTURE 45 a view from above of two crowded streams of people rushing in opposite directions. They are kept separate by a dividing wall, except between A and B. If the streams are closely packed and really in a hurry, the figure illustrates the possible fate of individuals. A person forced from either stream across into the other carries with him his momentum characteristic of the stream from which he has come. In this situation this causes a decrease in the momentum of the stream entered.

Sei. Instrum. 36, 267 (1959). 21. FUNK, J. , Improvements in polythene-shielded net radiometers, Proc. Symposium on Engineering Aspects of Environmental Control for Plant Growth (Melbourne), p. 248 (1963). 22. TANNER, C. , Basic Instrumentation and Measurements for Plant Environment and Micrometeorology. Soils Bulletin No. 6, Dept. , Univ. of Wisconsin, 1963. 23. MORIKOFER, W. (Chm), et al, Radiation instruments and measurements, Ann. Int. Geophys. Year, 5, 365 (1958). ) 24. FUNK, J. , A note on the long-wave calibration of convectionally shielded net radiometers, Arch.

All the terms in eqn. 8) have the nature of energy flux density, with units to agree with that chosen for LE of cal cm -2 sec-1. Terms on the right-hand side of this equation are positive if energy is removed from the surface. Any change in heat storage of the vegetation has been neglected in this equation, together with the small fraction used in photosynthesis (usually ~ 1 per cent of Rs). The relative importance of the terms in eqn. 8) can vary enormously. If a soil surface is moist or carrying an actively transpiring crop for example, the greater part of the available solar energy is commonly expended in the evaporation of water.

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