16 



TEANSLOCATION OF PLANT FOOD IN WHEAT SEEDLINGS. 



Table 3. — Relative amounts of plant material in the 'plumule and radicle during first i 



15 days' growth. ^ ^ 



WATER CULTURE. 





Nitrogen. 



Phosptioric acid. 



Potash. 



Weight. 



Part of plant and 

 age. 



Amount 

 per 100 

 plants. 



Per cent 

 of amount 

 in origi- 

 nal seed. 



1 

 P-- :SlS. 



1 



Amount 

 per 100 

 plants. 



Per cent 

 of amount 

 ia origi- 

 nal seed. 



Weight 

 per 100 

 plants. 



Per cent 

 based on 

 weight of 

 original 

 seed. 



Plumule: 

 3 davs. 



Grams. 



0.0207 



.0348 



.0365 



.0118 

 .0146 

 .0163 



.0325 

 .0494 

 .0528 



40 

 09 

 73 



23 



29 

 32 



65 

 98 

 104 



Grams. 



0. 0082 



.0167 



.0215 



.0058 

 .0070 

 .0090 



.0140 

 .0237 

 .0305 



25 

 50 



05 



17 

 21 

 27 



43 

 72 

 93 



Grains. 



0.0117 



.0190 



.0194 



.0048 

 .0036 

 .0047 



.0105 

 .0226 

 .0241 



59 

 95 

 97 



24 



18 

 24 



83 

 113 

 121 



Grams. 



0.466 



.895 



1.141 



.335 



.481 

 .629 



.801 

 - 1.376 



1.742 



13 



5 davs 



27 



7 days 



33 



Radicle: 



3 days 



10 



5 daj's 



7 days 



14 

 18 



Axis (plumule + rad- 

 icle): 

 3 days 



23 



5 days 



40 



7 days 



50 







NUTRIENT SOLUTION. 



Plumule: 



3 days 



0. 0106 

 .0208 

 .0387 

 .0471 

 .0657 

 .0668 



.0146 

 .0163 

 .0191 

 .0208 

 .0253 

 .0247 



.0252 

 .0371 

 .0578 

 .0678 

 .0910 

 .0915 



20 

 40 

 76 

 92 

 12S 

 130 



28 

 32 

 37 

 40 

 50 

 50 



50 

 74 

 114 

 134 

 180 

 182 



0.0042 

 .0109 

 .0215 

 .0367 

 .0515 

 .0626 



. 0065 

 .0097 

 .0142 

 .0136 

 .0163 

 .0166 



.0107 

 .0206 

 .0357 

 .0503 

 . 0678 

 .0792 



13 

 33 

 65 

 110 

 155 

 190 



20 

 30 

 43 

 41 

 50 

 50 



32 

 62 

 108 

 153 

 205 

 240 



0.0056 

 .0180 

 .0345 

 .0569 

 .0775 

 .0987 



.0100 



^ .0084 



.0072 



.0070 



30 

 94 

 180 

 300 

 405 

 520 



50 



44 



•38 



37 



0.190 

 .459 



L333 

 1.561 

 1.626 



.325 



.452 

 .732 

 .683 

 .767 

 .673 



.515 

 .011 

 1.701 

 2.016 

 2.328 

 2.299 



5 



5 daj^s 



13 



7 days 



28 



9 davs 



40 



12 davs 



44 



15 days . 



46 



Radicle: 



3 days 



9 



5 days 



13 



7 days 



21 



9 days 



19 



12 days 



22 



15 days. 



.0058 



.0156 

 . 0264 

 .0417 

 .0639 



30 



78 

 136 

 218 

 335 



19 



Axis (plumule + rad- 

 icle): 



3 days 



14 



5 davs 



26 



7 days 



49 



9 days 



57 



12 days 



66 



15 days 



1.045 



550 



66 







In the water culture (Table 3) the weight of the plumule and the 

 radicle together increased daily at a much slower rate than did the 

 absorption of nitrogen, phosphoric acid, and potash; that is, wliile 

 the weight increased from 23 to 50 per cent the nitrogen increased 

 from 65 to 104 per cent, the phosphoric acid from 43 to 93 percent, 

 and the potash from 83 to 121 per cent. In the nutrient solution 

 the behavior w^as similar, only somewdiat more pronounced. 



Considering the relative amounts of nitrogen, phosphoric acid, and 

 potash in the plumule and radicle, respectively, the table shows that 

 in distilled w^ater the weight of the plumule increased at a slower 

 rate than did the translocation and accumulation of nitrogen, phos- 

 phoric acid, and potash. 



In the case of the radicle the increase in weight is only a little less 

 than the increase in the retention of nitrogen, phosphoric acid, and 



