12 



EFFECTS OF AKTIFICIAL SHADING ON PLANT GROWTH. 



deeper shades, due to the introduction of outside air by the use of the 

 fan. It is clear that overheating in the deeper shades was completely 

 overcome by this method. 



BED B 



= SO/L &UMZ4CE 



=■ SO/L 



,5C | 2 3 4 5 6 12 3456 



Yig. 4.— "Diagrams showing temperatures at 6 p. m., averaged for the entire period of the experiments. 



In bed B the differences were more marked, the most important 

 differences having been the higher temperature of the air in the 

 deeper shades. 



SATURATION DEFICIT. 



The saturation deficits recorded are shown in figure 5. The differ- 

 ences at 6 a. m. and at 6 p. m. were only slight. At noon the differ- 



BED A BED B 

















\ 













400 















\ 

















--- 



» <■» " "* 



















300 



















































200 













































































100 



















^"S**^ 













«6V< 



">OA> 



W. 



- 



— « 



/e.oi 



?/*/ 





= 



6.00 



PM. 



I 2 345 612 345 £ 



Fig. 5.— Diagrams showing the saturation deficit (in thousandths of an inch) at 6 a. m., at noon, and at 

 6 p. m., averaged for the entire period of the experiments. 



ences between the two beds were very marked, the saturation deficits 

 having been comparatively low in the deeper shades of bed A and 

 comparatively high in the deeper shades of bed B. This high satura- 

 tion deficit in section 1 of bed B was the result of the higher air tem- 



279 



