82 



Journal of Agricultural Research voi. xviii. no. 2 



Table III. — Weight, composition, and total absorption per plant 



SAND CULTURES. SERIES 2 

 STEMS AND LEAVES 



60. 10 to 



1.30 

 1.85 

 2-95 



3-85 

 3- So 



2-35 



2. 46 

 3.61 



3-97 

 3-67 

 4-03 



0.30 

 •50 

 .69 



0.31 

 •41 

 •44 



o. 29 

 •S3 



2. 02 



.40 



2. 75 

 4.07 

 5.62 

 S-09 

 4-39 



0.36 

 .76 

 .14 



0.49 

 .66 

 1-34 

 2. 67 

 4.42 

 1.03 



STEMS AND LEAVES 



a Averages of 10 plants except in the o.io and o.io to 0.48 atmosphere concentrations, which were averages 

 of 5 plants. Mean deviation per plant approximately ±2 gm., for tops. 



'' Cultures started with solution of o.io atmosphere concentration, after 32 days changed to 0.48 atmos- 

 phere. 



The dry weights indicate that under these conditions a concentration 

 of O.IO atmospheres was too low, 0.25 atmospheres possibly sub-optimum, 

 while no important difference between 0.48 atmospheres and 1.45 atmos- 

 pheres was referable to the nutrient solutions. In other words, the 

 optimum concentration — that is, the least concentration giving a maxi- 

 mum yield — would be found between 0.25 atmospheres and 0.48 atmos- 



