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Effect of Light and Nitrogen and Potassium Levels on Growth..:

Joiner, J. N. ; Johnson, C. R. ; Krantz, J. K.
Journal of the American Society for Horticultural Science.  105 (1980)  2 - p. 170-173 , 1980
Link: https://doi.org/10.21273/jashs.105.2.170