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An Improved Technique for Subsoil Placement of Radioisotopes 1
Author(s) -
Newman James S.,
Hacskaylo Joseph,
Bloodworth Morris E.
Publication year - 1965
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1965.00021962005700030033x
Subject(s) - agricultural experiment station , subsoil , citation , library science , agriculture , computer science , environmental science , geography , archaeology , soil water , soil science
Finally we would like to comment on measuring the energy outputs of light sources of different spectral distributions. Foot-candle meters respond primarily to light in the 500 to 600 mu range. A look at Figure 1 shows clearly that for the same amount of energy in the 400 to 700 mu range, the cool white bulb has much more energy in the 500 to 600 mu range than does the Gro-Lux bulb, thus causing the foot-candle meter to read much higher for the cool white light. There is no readily available light sensor which properly integrates all energy in the 400 to 700 mu photosynthetic range. On the other hand, when comparing light under conditions where the spectral distributions do not vary, any light meter will show the proper relative amounts of light present.