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It is 20 years ago that Robert Emerson and C. M.Lewis (5) average energy on the cultivated surface during the growth period (27). Considering only wave lengths available for photosynthesis, the efficiencies were between 0.5 and 2 %, and the large deviation from photosynthetic efficiency in laboratory experiments of short duration-viz., 20 to 30 %-was the starting point of our work. Earlier computations of efficiency of higher plant growth are discussed in detail in (11). The possible reasons for the relatively low long term efficiency are as follows (27): 1)

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