228 



SCIENTIFIC AGRICULTURE 



March, 1922. 



A/of ia]i5 



Not 1 5/ IS 



\'o, IB/ IS 



Fig C Gormination of Poo comprQssa(L) 



Sfto^ina steadu and fluctuating tampararuro chongo-i 



ber 1, indicates the temperature changes temperature, brought about by the trans- 



of the germinator intended to be kept as fers from one germinator to the other, 



nearly as practicable at 16 deg. C. Flue- q^j^^^, fluctuations are similarly illustrated 



tuating temperatures are also illustrated m «„,i^« 



a comparative ^vay on this chart. For ex- m this tigure. 



ample, the fluctuation between 25 deg. C. I" aH, one hundred and eighty tests were 

 and 30 deg. C. for the day of November made in this experiment. Counts of ger- 

 14th 9 a.m. to 5 p.m., is indicated on curve minated seeds were recorded on the 6th, 

 4 and during the following night, 5 p.m. 10th, 14th, 21st, 28th and 35th days of 

 to 9 a.m.. on curve 3. At 9 o'clock, Xo- incubation. The averages of the counts of 

 vember 15th, it again changes back to the twelve samples under the ^ame germ- 

 curve 4, remaining until 5 o'clock of the ination conditions were calculated, and ap- 

 same afternoon, when it is again trans- pear on Table II. As two hundred seeds 

 ferred to curve 3, and so on to the end of were used for each test, the average per- 

 test. The vertical dotted lines at 9 a.m. cent germination is just half the average 

 and 5 p.m. thus represent the changes of total. 



Averag-e counts made on 12 samples on: 



Temperature 

 Conditions 



16 C 



20 C 



25 C 



30 C 



35 C 



16—20 C 



16—25 C 



16—30 C 



16—35 C 



20—25 C 



20—30 C 



20—35 C 



25—30 C 



25—35 C 



30—35 C 



Table II. — Voa Conipressa (L) — Germ- 

 ination results showing effects of Fluc- 

 tuating and Comparatively Steady Tem- 

 perature Conditions, 



