/ 



Robert A. Steinberg 

 TABLE V 



371 



Effects of Mineral Deficiency on Reducing Sugars and Total Carbohydrates 

 (sugars plus starch) of Plants: Magnesium, Calcium, Sulfur 



Mean 



0.79(2) 0.89(2) 1.15(3) !- 2 3(i) 



Sulfur deficiency 

 Soybean 

 Soybean (roots) 

 Sunflower 



Mean 



medium 0.84 0.84 



medium (0.67) (1.20) 



0.84 0.84 



0.18 1.44 



0.23 0.27 



0.21 (2) 0.86 (2) 



(9) 



(9) 



(10) 



stems responded similarly. Copper deficiency had a similar effect on 

 leaves of the tung tree. Withholding boron, however, led to increases in 

 total carbohydrates in leaves and stems, with relatively increased reduc- 

 ing sugar in the former and a decreased content in the latter. 



SOME DATA OF INDIVIDUAL INVESTIGATIONS 



A clearer idea of the meaning of the preceding summaries can be ob- 

 tained through an examination of some of the specific data. The follow- 

 ing have been selected on the basis of consistency in results, size of 

 plant samples, and comparison of effects in different organs in the 

 plant. Data meeting these criteria are confined almost entirely to 

 nitrogen, phosphorus, and potash. Attention is again called to the fact 

 that these data have been recomputed in terms of "quantity in deficient 

 plant/quantity in the control." 



