358 H. W. Turpin 
TABLE 4. RELATION BETWEEN THE Carson DiIoxIDE IN THE CropprpD Soin DURING 
THE Prriop or Most Active PLant GrRowTH, AND THE WATER TRANSPIRED 
Eacu Werk (Oats, 1918) 
Cropped soil Uncropped soil 
Per cent of carbon 
dioxide to each 
Total pound of water 
water Difference =" 
Water trans- in carbon 
Date trans: ae vcrege preraee dioxide 
pire eac carbon carbon CGSr 
(grams) week Carbon dioxide Corben dioxide F Cc 
(grams) ( perhean for a (aca for ie (F) A A 
7 week = week 5 
(B (per cent) ) (per cent) (G) (H) 
(C (4) 
Marchi an sos 0.695). 0.236 
March 7 | 3:35 9.00 0.550 | 0.667 0:305 0.266 0.401 0.045 0.074 
March 11 9.75 834 . 236 9 
March 14 22 19.50 0.969 0.902 0.226 0.231 0.671 0.034 0.046 
March 18 4.25 , .688 .285 
March 21 | 19.75 34.00 29909 1.989 0.471 0.378 1.611 0.047 0.059 
March 25 | 24.00 2.103 ny B25 ; 
March 28 17.50 41.50 999: 2.164 0.319 0.289 1.875 0.045 0.052 
April 1 30.75 | 22514 33 2 
April 4 2700 ato 2.314 2.414 0.318 0.325 2.089 0.036 0.042 
Au Pa ee ei ciiois Parese lee cre nee Ue Male 2.318 0.049 0.053 
April 15 22.25 E 2.704 0.320 
Npril 18 29°75 52.00 2 80 2.642 0.311 0.316 2.326 0.045 0.051 
April 22 | 24.95 Bi O19) 2 ; 
April 25 15:00 39.25 2.678 2.404 0.303 0.257 2.147 0.055 0.061 
April 29 8.50 2.418 ‘ .236 94 2 
May 2 21.00 59.50 2069 2.244 0.211 0.224 2.020 0.034 0.038 
Vee. SON y@le25q| Soa, 21)\i2132042) |e ese anf ORaer 2.675 0.044 0.050 
Mieann's is. 2x5. avehoubtes ekevevencvever soc tehovetore eee 0.043 0.053 
+.0014 + .0022 
Standardideviation «oss sisienio eee 0.0065 0.0102 
+.0010 +.0015 
Coefficient of variability............ 155,11 19.17 
+2 .32 +3.12 
TABLE 5. RELATION BETWEEN THE Dry WEIGHT OF THE CROP AND THE CARBON DIOXIDE 
GIvEN OFF BY PLant Roots 
(From Stoklasa and Ernest, 1909) 
Total Total Milligrams of 
dry matter | carbon dioxide | carbon dioxide 
Cro; produced produced produced to 
in 84 days in 84 days | each milligram 
(milligrams) (milligrams) | of dry matter 
Bair eyo ere sase op eice ac Mieeroeel ema pastas lente 34,493 260 0.037 
I RAK IA cae RONAN eee, REE A a Se heapear Gna 27 ,046 1,053 0.0389 
LOT HS Nar ntR os lrecereccGrict siete aie etet hs le 26,215 793 0.02 
Wala tiie estore Pia emmy aogier ahaa 18 ,375 784. 0.0438 
SACVET ABO ee a ey AN i eal cornea Maret 26, 532 974. 0.037 
