IQI2] 



SKINNER— CREA TININE A ND CREA TINE 



155 



50 ppm. of creatinine. As shown in the photograph, the plants in 

 each culture containing creatinine, regardless of the proportion of 

 potash and phosphate, is larger than the plants grown in a similar 

 solution without the creatinine, 

 able in the roots as well as the tops. The tops in each case are 



The increased growth is notice- 



branched 



Effect of creatinine in cultures containing 8 ppm. NH 3 as nitrate 



Since creatinine was very beneficial in cultures containing no 

 nitrate, it is interesting to observe its effect in cultures which con- 

 tain a small amount of nitrate. 



Table II gives the result of the 



TABLE II 

 Showing the effect of creatinine on growth in culture solutions composed 



of fertilizer mixtures, containing 8 PPM. OF NH 3 AS nitrate 



No. 



PPM. OF FERTILIZER INGREDIENTS IN CULTURE 



SOLUTION 



Green weight of culture 



IN GRAMS 



PA 



NH 3 



K,0 



Without 

 creatinine 



With 

 creatinine 



I 







8 



16 



24 

 32 

 40 



48 



56 

 64 



72 



8 

 8 

 8 

 8 

 8 

 8 

 8 

 8 

 8 

 8 



72 



64 



56 



48 



40 



32 



24 



16 



8 







1.820 



2.470 



2.748 



2.907 

 2.670 

 2.928 



2.526 



2.600 

 2.048 



1.354 



2.190 

 3.100 

 3250 

 3.420 



2.450 

 3-253 



3 -340 

 3.000 



2-359 

 1 -750 



2 



3 



4 



s 



6 



7 



8 





10 





effect of creatinine on growth in culture solutions composed of 

 8 ppm. of NH 3 as nitrate, and varying amounts of phosphate and 

 potash, the total concentration of each solution being 80 ppm. of 

 PaOs+NHj+KjO. By comparing the figures it is seen that the 

 growth with creatinine, given in the last column, is larger than th< 

 growth without creatinine, given in the fifth column. The differ- 

 ence, however, is not nearly so large as in solutions containing no 

 nitrate, presented in table I. The total green weight of the cultures 

 composed of fertilizer mixtures containing 8 ppm. of nitrogen with- 

 out creatinine was 24.071 grams against 28.117 grams in the cul- 



