CONDITION OF PLANTS AT THE END OF 50 DAYS. 



23 



light to n/15 reduced the weight many times, and at n/93 only pota- 

 toes and cotton remained alive. In general, no growth was made in 

 light of an intensity equal to n/15 or less after the food supply in the 

 seeds had been exhausted. As a rule, light intensities ranging from 

 n/7 to n/2 produced heavier plants than normal light. 



Table VIII. — Average green weight of plants at the end of 50 days, in percentages of 

 weight of plants in normal light. 







Section 



number and light intensity. 





Bed and plants. 

























1. d/93. 



2, n/15. 



3. n 7. 



4. no. 



5, n/2. 



6, n. 



Bed A (with fan): 















Potato 



28 



44 



282 



139 



238 



100 



Cotton 







18 



63 



91 



223 



100 



Radish 







3 



103 



157 



228 



100 



Lettuce 







4 



106 



124 



129 



100 



Bed B (without fan): 















Potato 



23 



27 



160 



250 



146 



100 



Cotton 



s 



10 



31 



177 



178 



100 



Radish 







1 



55 



119 



107 



100 



Lettuce 







9 



147 



107 



107 



100 



The tallest plants (Table IX) were produced under light intensities 

 ranging from n/7 to n/2, while those in n/93 to n/15 were generally much 

 shorter than in full light. The ratios between height in the various 

 shades in which an increase was observed and height in normal light 

 were not as great as were the ratios between weight in the shades in 

 which an increase took place and that in normal light, which indicates 

 that the plants under the weaker shades were heavier in proportion to 

 their height than plants grown in normal light. 



Table IX. — Average height of plants at the end of 50 days, in percentages of height in 



normal light. 



Bed and plants. 



Section number and light intensity. 



1, n 93. 



2, n 15. 



3, n/7. j 4, n/5. ; 5, n/2. 



6, n. 



Bed A (with fan): 



Potato 



112 

 

 

 



108 



32 







100 

 66 

 52 

 91 



88 

 38 

 26 



19 

 108 

 165 

 145 



142 

 122 

 96 



171 

 130 

 178 

 136 



165 

 108 

 117 



175 

 133 

 126 

 97 



125 

 130 



117 



100 

 100 



Radish 



Lettuce 



Bed B (without fan): 



Potato 



Cotton _ 



Radish 



100 

 100 



100 

 100 

 100 



The greatest diameter of the stem (Table X) was found in plants 

 grown in the weaker shades, with one exception. With a reduction 

 to n/5 or less, most of the plants showed a decided reduction in stem 

 diameter. 



279 



