INORGANIC CONSTITUENTS. 



13 



The weight of the entire plant gradually decreased from the begin- 

 ning, until after 12 days a loss of approximately 40 per cent was 

 recorded. 



SEEDLINGS GROWN IN NUTRIENT SOLUTIONS. 



EFFECT OF SOLUTION CONTAINING ONE FERTILIZING ELEMENT ON 

 ABSORPTION OF PLANT FOOD. 



Table 2 shows the effect of growing seedlings in solutions con tain- 

 ing only one fertilizing element on the absorption of that constituent 

 by the plant, and likewise on the absorption of the other constituents 

 dissolved from the seeds, as compared with the absorption of these 

 same elements by plants grown in water cultures. The solutions 

 used contained, respectively, 100 and 150 parts per million of nitrate 

 in the form of sodium nitrate, 64 and 150 parts per million of phos- 

 phoric acid in the form of sodium phosphate, and 50 and 150 parts 

 per million of potash in the form of potassium chlorid. 



Table 2. — Amounts of nitrogen, phosphoric acid, and potash in the axes (plumule -{-radi- 

 cle) at the end of 9 days, when grown in different nutrient solutions. ^ 



Constituents and total weight. 



Nitrogen 



Phosphoric acid 



Potash 



Total weight of axes 



Nitrate solutions. 



Water 

 control. 



Graw.s. 

 0. 04G6 

 . 0230 

 .0173 

 1.490 



100 parts 

 NO3 per 

 million. 



Grams. 



0. 0668 

 .0270 

 .0192 



1.706 



Increase 



based on 



water 



control. 



Per cent. 

 43 

 14 

 11 

 14 



Water 

 control. 



Grams. 



0.0446 



.0240 



.0186 



1.294 



150 parts 

 NO3 per 

 million. 



Grams. 

 0. 0600 

 .0277 

 .0202 

 1.456 



Increase 

 based on 



water 

 control. 



Per cent. 





Phosphoric-acid solutions. 



Constituents and total weight. 



Water 

 control. 



64 parts 

 P2O5 per 

 million. 2 



Increase 



based on 



water 



control. 



Water 

 control. 



150 parts 

 P2O5 per 

 million. 



Increase 



based on 



water 



control. 



Nitrogen 



Grams. 

 0. 0471 

 . 0260 

 .0216 

 1.435 



Grams. 

 0.0500 

 .0350 

 .0201 

 1.667 



Per cent. 



5 

 35 





 11 



Grams. 



0. 0477 



.0282 



.0216 



1.594 



Grams. 



0.0460 



.0355 



.0217 



1.654 



Per cent. 

 





26 



Potash 



Total weight of axes 



? 









Potash solutions. 



Constituents and total weight. 



Water 

 control. 



50 parts 

 K2O per 

 million. 



Increase 



based on 



water 



control. 



Water 

 control. 



150 parts 

 K2O per 

 million. 



Increase 



based on 



water 



control. 



Nitrogen 



Grams. 



0. 0460 

 .0202 

 .0202 



1.256 



Grams. 

 0. 0466 

 .0244 

 .0807 

 1.444 



Per cent. 



1 



20 



200 



15 



Grams. 



0.0488 

 .0255 

 .0231 



1.526 



Grams. 



0. 0443 

 .0278 

 .0558 



1.740 



Per cent. 

 



Phosphoric acid 



9 



Potash 



140 



Total weight of axes 



14 







See page 30, appendix, for detailed data on which this table is based. 



2 Figures for 12 days. 



