The effects of artificial shading on plant growth in Louisiana effectsofartific279shan Year: 1913 Jul. 279, Bureau of Plant Industry, U. S. Dept. of Agriculture. Plate IV. Fig. 1.—Leaf Prints of Lettuce from Beds A and B at the End of 30 Days. Shades as Numbered, Ranging from 2 (n/15 Light) to 6 (Normal).

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