TABLES 



2 55 



CONVENTIONAL CONSTANTS OF SOME OF THE PRINCIPAL 

 PROCESSES OF PLANT PHYSIOLOGY. 



(For the explanation of their derivation and use, see page 21.) 



Growth 

 (page 207). 



Temperatures for plants commonly used in experiment: 

 Minimum. Optimum. Maximum. 



Photosynthesis 

 (page 113). 



Formula of the Photosynthate, C,H,,O 6 . 



Photosynthetic Equation, 6CO 2 +6H 2 O = C 6 H I2 O 8 +6O 2 . 



Quantity of Photosynthate made in leaves: 

 Out-of-doors, 0-1-2 gm^h. 

 Greenhouse, -.5-1 gm*h. 



Synthesis of i gram of Photosynthate requires i . 5 g. (750 

 cc.) of carbon dioxide, which is all that is contained in 

 2500 liters of air, which is a column i meter square 

 and 2.5 meters high. 



Energy of strong sunlight used, i%. 



Energy stored is the reciprocal of that released in Res- 

 piration (see below). 



Respiration 

 (page 141). 



Formula of material used (ultimately), C 6 H, 2 O 6 . 

 Respiratory Equation, C 6 H. 2 O 6 + 6O 2 = 6CO 2 +6H 2 O. 

 Quantity of material used in Respiration : 



20 30 4 



Leaves .12 (60 cc.) .30 (150 cc.) .65 (325 cc.) gm 2 h, 

 Leaves 4. } 

 Buds 15. [ gkh. 

 Seeds 30 . ; 



Energy developed from i gram Photosynthate equals 4000 

 calories. This is half the energy yielded by combus- 

 tion of equal weight of best fuel. 



Root Exudation and 

 Pressure (page 157). 



Exudation 1-25-300 cc. 



Pressure . 3- . 9-1 . 6 atmospheres. 



Stomata 

 (page 192). 



Numbers in plants used commonly in experimentation: 

 0-100500 per mm 2 , which is over 100 to the square 

 millimeter, or ten million to the square meter. 



Size of Pore is 18X6 microns, giving an area of 100 

 square microns,' which is T ^ part of the epidermal 

 surface. 



Transpiration 

 (page 193). 



In greenhouse 

 plants 



by day 15-50-250 gm^h. 

 by night 1-10-20 gm^h. 

 day and night together 1-30-250 gm*h. 



