28 



WATER-RELATION BETWEEN PLANT AND SOIL. 



Table 2. — Data for Coleua. 



Day 

 and 

 hour. 



Feb. es 



Hour 9 



10 



11 



12 



13 



14 



16 



16 



17 



18 



19 



20 



21 



22 



23 



24 



Feb. «4 



Hour 1 



2 



3 



4 



5 



9 



. 10 



Mar. 2S 



Hour 10 



11 



12 



13 



14 



IS 



16 



17 



18 



19 



20 



21 



22 



23 



24 



Mar. S4 



Hour 1 



2 



3 



4 



S 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



Change 



of 

 weight. 



grams 

 0.0 

 -4.0 

 -5.0 

 -7.0 

 -6.0 

 -6.0 

 -2.0 

 -1.0 

 -1.0 

 +4.0 

 +3.5 

 +2.5 

 +3.0 

 +1.5 

 +0.5 

 +3.0 



0.0 

 +2.0 



0.0 

 +1.0 



0.0 

 +2.0 

 +0.5 



0.0 

 -1.5 

 -3.0 



-5.0 

 -5.0 

 -6.0 

 -3.0 

 -2.0 

 0.0 

 +4.0 

 --2.0 

 --2.5 

 --2.0 

 .+2.5 

 +2.0 

 --2.0 

 --2.0 

 +2.0 



+1.0 

 +1.0 

 +0.5 

 +1.5 

 +1.0 



0.0 

 -1.0 

 -3.0 

 -3.0 

 -4.0 

 -4.0 

 -6.0 

 -5.0 

 -3.0 



0.0 

 +4.0 

 +4.0 

 +2.0 



Actual loss. 



Irriga- 

 tor.! 



c.c. 

 1.6 

 2.3 

 2.2 

 3.4 

 5.1 

 5.4 

 5.7 

 6.6 

 6.0 

 6.5 

 4.9 

 3.1 

 3.0 

 2.9 

 2.1 

 2.1 



2.1 

 1.9 

 1.4 

 2.1 

 1.4 

 1.6 

 1.4 

 1.5 

 1.4 

 1.6 



3.4 

 4.1 

 5.2 

 6.4 

 7.8 

 6.6 

 6.2 

 4.0 

 3.5 

 2.8 

 2.8 

 2.3 

 2.4 

 1.9 

 2.2 



1.5 

 1.8 

 1.6 

 1.7 

 1.3 

 1.7 

 1.8 

 2.4 

 3.2 

 4.0 

 4.7 

 5.5 

 6.7 

 7.5 

 7.6 

 6.2 

 4.0 

 3.7 



Trans- 

 piration. 



grama 



1.6 



6.3 



7.2 



10.4 



11.1 



11.4 



7.7 



7.6 



7.0 



2.5 



1.4 



0.6 



0.0 



1.4 



1.8 



-0.9 



2.1 

 -0.1 

 1.4 

 1.1 

 1.4 

 -0.4 

 0.9 

 1.5 

 2.9 

 4.8 



8.4 

 9.1 

 11.2 

 9.4 

 9.8 

 6.8 

 2.2 

 2.0 

 1.0 

 0.8 

 0.3 

 0.3 

 0.4 

 -0.1 

 0.2 



0.5 



0.8 



1.1 



0.2 



0.3 



1.7 



2.8 



5.4 



6.2 



8.0 



8.7 

 11.5 

 11. 

 10. 



7. 



2, 



.7 

 1.5 

 .6 

 1.2 

 0.0 

 1.7 



Atmom. 

 eter.' 



c.c. 

 0.88 

 0.96 

 1.36 

 1.36 

 1.52 

 1.20 

 1.12 

 1.12 

 0.88 

 0.72 

 0.80 

 0.66 

 0.56 

 0.64 

 0.48 

 0.48 



0.58 

 0.56 

 0.48 

 0.66 

 0.48 

 0.48 

 0.52 

 0.44 

 0.62 

 0.68 



.48 

 .53 

 .53 

 90 



.75 



.46 



.39 



.10 



.39 



0.51 



0.96 



0.80 



0.80 



0.73 



0.73 

 0.58 

 0.73 

 0.66 

 0.73 

 0.58 

 0.68 

 0.80 

 0.95 

 1.17 

 1.02 

 0.95 

 1.24 

 1.61 

 1.31 

 1.17 

 1.17 

 0.88 



Average for first 24 hours (10 a.m. Feb. 23 to 



9 a.m. Feb. 24 incl.) 



Average for second 24 hours (10 a.m.' Mar 23 



to « a.m. Mar. 24 incl.) 



Loss, relative to that of 

 hour 3, Feb. 23. 



Irrigator 

 (/) 



1.14 

 1.64 

 1.57 

 2.43 

 3.64 

 3.86 

 4.07 

 4.72 

 4.28 

 4.64 

 3.50 

 2.21 

 2.14 

 2.07 

 1.50 

 1.50 



1.50 

 1.36 

 1.00 

 1.50 

 1.00 

 1.14 

 1.00 

 1.07 

 1.00 

 1.14 



2.43 

 2.93 

 3.72 

 4.57 

 5.54 

 4.72 

 4.43 

 2.88 

 2.60 

 2.00 

 2.00 

 1.64 

 1.71 

 1.36 

 1.67 



1.07 

 1.29 

 1.14 

 1.21 

 0.93 

 1.21 

 1.29 

 1.71 

 2.19 

 2.88 

 3.36 

 3.93 

 4.79 

 5.38 

 5.50 

 4.43 

 2.86 

 2.64 



2.26 

 2.36 



Trans- 

 piration 

 (D. 



1.14 

 4.50 

 5.11 

 7.43 

 7.93 

 8.14 

 5.50 

 5.43 

 5.00 

 1.79 

 1.00 

 0.43 

 0.00 

 1.00 

 1.14 

 0.00 



1.50 

 0.00 

 1.00 

 0.79 

 1.00 

 0.00 

 0.64 

 1.07 

 2.07 

 3.29 



6.00 

 6.50 

 8.00 

 6.72 

 7.00 

 4.71 

 1.57 

 1.43 

 0.71 

 0.57 

 0.21 

 0.21 

 0.29 

 0.00 

 0.14 



0.36 

 0.57 

 0.79 

 0.14 

 0.21 

 1.21 

 2.00 

 3.66 

 4.43 

 5.72 

 6.22 

 8.22 

 8.36 

 7.50 

 5.50 

 1.57 

 0.00 

 1.21 



2.60 

 2.39 



Atmom- 

 eter 

 (E). 



1.83 

 2.00 

 2.a3 

 2.83 

 3.17 

 2., 50 

 2.33 

 2.33 

 1.83 

 1.50 

 1.87 

 1.17 

 1.17 

 1.33 

 1.00 

 1.00 



1.17 

 1.17 

 1.00 

 1.17 

 1.00 

 1.00 

 1.08 

 0.92 

 1.08 

 1.42 



3.04 

 3.19 

 3.19 

 3.96 

 3.85 

 3.50 

 3.04 

 2.90 

 2.29 

 2.90 

 1.06 

 1.98 

 1.87 

 1.67 

 1.52 



1.52 

 1.22 

 1.52 

 1.37 

 1.52 

 1.22 

 1.37 

 1.67 

 1.98 

 2.44 

 2.12 

 1.98 

 2.68 

 3.35 

 2.73 

 2.44 

 2.44 

 1.83 



1.69 

 2.21 



Derived values, 



relative to hour 3, 



Feb. 23. 



Relative 

 transpi- 

 ration 



0.62 

 2.75 

 1.82 

 2.84 

 2.50 

 3.25 

 2.36 

 2.33 

 2.73 

 1.19 

 0.60 

 0.37 

 0.00 

 0.76 

 1.14 

 0.00 



1.28 

 0.00 

 1.00 

 0.67 

 1.00 

 0.00 

 0.60 

 1.16 

 1.92 

 2.32 



1.97 

 2.04 

 2.51 



1.70 

 1.92 

 1.35 

 0.52 

 0.49 

 0.31 

 0.20 

 0.20 

 0.11 

 0.17 

 0.00 

 0.09 



0.24 

 0.47 

 0.52 

 0.10 

 0.14 

 0.99 

 1.45 

 2.19 

 2.24 

 2.34 

 2.93 

 4.15 

 3.24 

 2.24 

 2.01 

 0.64 

 0.00 

 0.66 



1.33 

 0.91 



Environ- 

 mental 

 aridity 

 (-E7). 



2.09 

 3.28 

 4.44 

 4.05 



11.54 

 9.64 

 9.48 



11.00 

 7.84 

 6.96 

 5.85 

 2.58 

 2.51 

 2.76 

 1.50 

 1.50 



1.76 

 1.59 

 1.00 

 1.78 

 1.00 

 1.14 

 1.08 

 0.99 

 1.08 

 1.82 



7.39 



9.35 



11.87 



18.10 



20.22 



16.52 



13.47 



8.29 



5.73 



5.80 



2.12 



3.25 



2.86 



2.27 



2.39 



1.83 



1.57 



1.73 



1.66 



1.41 



1.48 



1.77 



2.86 



4.34 



6.98 



7.12 



7.78 



12.36 



17.96 



16.02 



10.81 



6.98 



4.83 



4.04 

 8.17 



"Irrigator column 60 cm. high in first series, 100 cm. in second. 

 «omprbrt'foth^t&&re\X^^Xtlt*d°;^^^^^^ 



