THe CARBON DIOXIDE OF THE Sor AIR 357 
TABLE 3. RELATION BETWEEN THE CARBON DIOXIDE IN THE CRoprpEeD SOIL DURING 
THE Preriop or Most Active PLANT GROWTH, AND THE WATER TRANSPIRED 
Eacu WEEK (Oats, 1917) 
Per cent of carbon 
Cropped soil Uncropped soil dioxide to each 
Total d pound of water 
Water | Water |-——_L- Difference 
Dat trans- pired Average Average Sa REE ats 
aE pired each Carbon | C2tbon | Carbon | carbon C—E F Cc 
(grams) | week | dioxide | dioxide | dioxide | dioxide — — 
(grams) |(per cent)| for the |(per cent)| for the (F) A A 
C (B week week (G) (H) 
(per cent) (per cent) Fat 
(C) (E) oe 
May 7 5.75 0.943 0.776 » 4 
May li Te 13.00 0.931 0.937 0.632 0.704 0.233 0.018 0.072 
ay 14 .00 422 ? a = 
May 18 16.75 Da TS) 1.166 1.294 0.475 0.677 0.617 0.022 0.047 
eeeltaoe pi2pees) | 1-994 |) taza | 0-292 |e 0.434 0.740 0.029 0.046 
May 28 14.50 1.297 0.477 S 
June i 2025 34.75 2.031 1.664 0.648 0.563 1.101 0.032 0.048 
une 4 WGIS745) 1.708 . 698 
June 8 23.75 39.50 1.982 1.845 0.530 0.614 UPRIL 6.031 0.047 
une 11 20.75 e .365 452 y rE : 
June 15 27.09 47.75 1.202 1.329 0.416 0.434 0.895 0.019 0.028 
une 18 20.5 = |) sis 4 re = 
June 29 31.25 si ba zea) 1.809 1.562 0.480 0.450 fa Bi 0.621 0.03 
une 25 27.00 .412 -466 
June 29 39 50 66.50 1.846 1.629 0.496 0.481 1.148 0.017 0.024 
July 2 24.00 1.778 0.620 0.507 
July 6 rs “s pee anf) k SOR OREO [RE an Ay (cd [ean 0) ui 393 CVE i ale 6 6:0) = een fl \60)01e,¢ e160, 1) 8le 4810 e)slese 
ay SF adlesai ce |e 22 00) || 42cog } | 2-657 | Gage | | 0-422 1.235 0.027 0.037 
Mean 3.5 syte Seetvets hes eeavaiw ciaeietarensvecees .024 0.042 
+.0012 +.0031 
Standard deviation.......:........ .0054 0.0136 
: +.0C09 +.0022 
Coefficient of variability............/22.5 ' | 37.40 
43.74 45.65 
