Influence of the composition and concentration of the nutrient solution on plants grown in sand cultures . J_ 20 30 10 50 60 70 Dg. total concentral ionFig. 9.—Graph showing the influence upon height of total concentrationin series III. 362 University of California Publication* in Agricultural Sciences [Vol. 1 greatest flower production occurred in group B, and plant 5 ofthis group produced a larger number of flowers than any otherplant in any series. INJURY DUE TO EXCESS OR DEFICIENCY OF NUTRIENT SALTS The deficiency or excess of certain elements will cause injurywhich is very characteristic.
Influence of the composition and concentration of the nutrient solution on plants grown in sand cultures . J_ 20 30 10 50 60 70 Dg. total concentral ionFig. 9.—Graph showing the influence upon height of total concentrationin series III. 362 University of California Publication* in Agricultural Sciences [Vol. 1 greatest flower production occurred in group B, and plant 5 ofthis group produced a larger number of flowers than any otherplant in any series. INJURY DUE TO EXCESS OR DEFICIENCY OF NUTRIENT SALTS The deficiency or excess of certain elements will cause injurywhich is very characteristic. Gris as early as 1843 showed thatchlorosis was caused by a lack of iron in the nutrient starvation likewise has long been known to cause chlo-rosis, a condition which may also result from an excess of soluble wt. of , , Fig. 10.—Graph showing the influence upon dry weight of tops of equalquantities of K_S04 in the different groups of series III. Magnesium starvation results in injury to thechlorophyll bodies, and in excess is harmful unless antagonizedby Other physiological disturbances not so well estab-lished as these mentioned have been considered to be associatedwith a deficiency or excess of nutrient elements. The most marked indication of the fact that certain culturesin this experiment did not furnish a normal medium for growthwas seen in the chlorosis which is so characteristic of plantsgrown in solutions which are deficient in nitrogen. This typeof injury was uniformly present in all cultures containing less of NaNO.,, but was especially marked in series I, plants1, 2, and 3, of all groups. It is not possible to draw a sharp 29 Crone, Sitzungsber Neiderrhein. Ges. und Heilk, Bonn, 1902,pp. 167-173. 3»Loew and May, U. S. Dept. Agrio. Bur. Pla
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