Jan. 3. 1920 Relation of Moisture in Substrata to Salt Balance 363 



Table II. — Average dry -weight of wheat roots grown 28 days in sand cultures supplied 

 with 3-salt solutions, all having an osmotic concentration value of approximately i.yj 

 atmospheres 



Culture No. 



RiCi 

 C2 

 C3 

 C4 

 C5 

 C6 



C7 



C8 



R2C1 



C2 

 C3 

 C4 



cs 



C6 



C7 



R3C1 



C2 



C3 

 C4 



Cs 



C6 

 R4C1 

 C2 

 C3 

 C4 

 Cs 



R5CI 

 C2 



C3 

 C4 



R6CI 

 C2 



C3. 



R7CI 



C2 



R8CI, 



Average dry weights of tops (s plants). 



Series A, 10 per cent 

 moisture content. 



Absolute. 



Gm. 



o. 0903 

 .2013 

 . 1829 

 . 2263 



• 2332 

 .2056 



. 2129 



• 2153 



• 1475 

 .2322 



• 2247 



. 2I4I 



.2566 

 .2481 



. 2360 

 . 1622 



• 1965 

 .2225 

 .2174 



•2745 

 •2363 

 . 1708 



• 2159 

 .2285 

 . 2619 

 .2824 

 .1813 

 .2542 



•2S45 

 . 2663 

 . 2002 

 •236s 

 .2436 

 .1769 



• 2453 

 . 1904 



Relative to 

 RiCias 

 imity. 



1. 00 



2. 27 

 2. 10 

 2. 54 

 2.63 



2-33 

 2. 42 

 2. 42 



1. 69 

 2-57 

 2-53 



2. 46 

 2. go 

 2.87 

 2.68 

 1.82 

 2. 17 

 2-45 

 2-39 

 2.98 



2- S4 

 1.89 



2-39 

 2. 51 

 2. 96 

 3.17 

 1.99 

 2.77 

 2. 76 

 2.94 

 2. 24 

 2. 62 

 2. 69 

 2. 04 



2-75 



2. 13 



Series B, 15 per cent 

 moisture content. 



Absolute. 



Gm. 



o. I7SO 



•2475 

 .2645 

 .2893 

 . 2t;o6 

 .2698 



•2503 

 .2414 

 . 1964 

 . 2528 

 . 2600 

 . 2279 



•3173 

 .3296 

 . 2920 

 . 2196 

 •2378 



• 2823 

 .2597 

 •3165 



•3254 

 . 2267 

 .2879 

 •3023 

 •3239 

 •3998 

 . 2077 



•3439 

 •3231 

 •3603 



•2455 

 .3012 



•3370 

 •2685 



• 2459 

 .2769 



Relative to 

 RiCi as 

 unity. 



I. 00 



I. 40 

 1.50 

 I. 64 

 I. 41 



1-53 

 1.44 

 1.36 

 I. 12 

 I. 42 



1-45 

 I. 29 

 1.78 

 1.84 

 1.68 

 1.24 



1.58 



1.47 

 I. 81 

 1.87 

 I. 29 

 I. 62 

 I. 69 

 1.84 

 2.26 

 I. 19 



1-93 



1. 81 



2. 06 



1-39 

 I. 69 

 1.94 

 1.52 

 I. 42 

 1.58 



Series C, 20 per cent 

 moisture content. 



Absolute. 



Gm. 

 O. 1546 

 .1895 

 .1972 

 . i860 

 . 2004 

 .2031 

 .2034 

 •2235 

 . 1672 



• 2013 



• 1815 



•1777 

 . 2028 



•22S9 

 . 2072 



• 1855 



• I7S7 

 .1963 

 . 2221 

 . 2196 



• 1S85 



• 1693 

 . 2021 

 . 1982 

 •2378 



• 2131 



•1975 

 . 2409 

 . 2609 

 .2860 

 . 1900 



• 2443 

 •2431 

 •2599 

 .2469 

 .2392 



Relative to 

 RiCi as 

 unity. 



I. 00 

 I. 22 

 I. 26 

 I. 17 

 I. 29 

 1.28 

 1.28 

 1.42 

 1.08 

 1.30 

 I. 19 

 I. 17 



1-33 

 I. 46 



I- 31 

 I. 21 

 I. 12 

 I. 26 

 I. 42 



1-37 

 I. 18 

 I. 10 



I- 31 

 I. 26 

 I. SO 

 1.38 

 1.28 



1.68 

 1.84 



I. 24 



1.56 

 I. 61 

 1.58 

 1.52 



The relative yield values of tops and of roots, taken directly from the 

 proper columns of averages in the tables, were plotted on the triangular 

 diagrams, as was done in earlier publications and by other writers. Since, 

 however, the medium and low yields are of little interest in this connec- 

 tion, only that group of nine cultures in each series which produced the 

 highest yields (upper one-fourth) will be considered in this discussion. 

 On the diagrams of figure i areas are outlined to show the distribution of 

 the 9 highest yield values of tops for each of the three different series 

 of 36 cultures. The region or regions in each diagram including these 

 nine high-yielding cultures are indicated by shaded areas. The highest- 

 yielding culture in each series is marked by a circle. 



