io8 



BOTAXICAL GAZETTE 



[FEBRUARY 



nitrogen leaves were in every case stiff and upright. By March 16 

 the "no phosphorus' ' series began to show the effect of the defi- 

 ciency. The "no potassium" series in the warm house showed the 



TABLE III 

 Proportion of leaves (blade and sheath) 



STEMS 



IOO PARTS of total plants, based on green weight 



44- 



24. 



40. 

 108. 



87. 



104. 



Culture no. and treatment 



High N warm 



High N warm 



High P and N warm 



High N cool 



High N cool 



High P and N cool . 



Leaves (blades 



and sheaths) 



Percentage 



92 



88 



96 

 69 



65 



95 



23 



87 

 20 



68 



71-37 



Stems 

 Percentage 



7 

 11 



3 



30 



34 



28 



05 

 73 



23 



80 



32 

 63 



greatest lopping over on March 



About 



the cool house began to outstrip the plants in the warm house in 



m 



an upright growth habit. 



amount 



Fig. 3. — Nitrogen series, cool house: note vigorous upright condition of no. 85 

 as compared with sprawling condition of no. 2$ (fig. 4). 



the higher temperature was about the same, but it was differently 



distributed, as will be apparent from the data given in table III. 



By April 19 all plants in the cool house had outstripped those in 



the warm house. The most striking difference between the two 



