Jan. .a, .9^ Water Requirement of Rust-Infected Wheat 
III 
wilting at any time, and since the soil water-content was brought back 
to maximum at three-day intervals, it is believed that these plants made 
their growth under very favorable conditions of soil moisture. P Therefore 
*® r Q ed V ced . y le d shown b y mfected plants should be attributed to the 
o? de“ top°m en °t °' m “ iStUre f " ”°™“ 
Mineral nutrients were supplied in solution as stated. The composition 
, tb . e dl! ^rent nutrient solutions used is shown in Table I. As P a basic 
lution Shive s (16) R 3 C 3 was used containing Ca(N 0 3 ),, KH PO and 
MgSOj.m the gram-molecular proportions 0.0078, 0.0108, and 0 ^0^ 
respectively, and 5 cc. of ferric phosphate solution [Tottingham (ro)l 
was added to each liter Stock solutions of the salts were made up in 
SL ^^ 0™ 7° f leCula f r . concentration, and diluted at the time of 
renewal.™ C ° mplete nutrlent solutl °n was made up fresh for each 
To the basic nutrient solution, nitrogen as N 0 3 , phosphorus as PO 
and potassium as chlond, were added in two concentrations to form six 
modified solutions, the added salt in each case being one which did nS 
nf a ^T Eny Catl °? “ nder test < See Table b) The concentrations 
^ t C ° rder that would result from application of 
£ ? J S0dlum nitrate - 420 pounds of sodium biphosphate and 
aS K? 5 *? P ° taSSmm . chlorid P er acre > for the lowerconcentration 
alWbl add these cjuantities for the greater concentration, assuming that 
all the added salts would be retained in the surface foot. 
Table I. -Composition in grams and gram-molecules per liter of the nutrient solutions 
used in n different cultures 
Component salts. 
€a(N0 3 ) 2 : 
Gm. 
Gm. mols_ 
NaNOs: 
Gm. 
Gm. mols. 
KH2PO4: 
Gm. 
Gm. mols. 
NaH 2 POt: 
Gm. 
Gm. mols... . 
MgSOc 
Gm. 
Gm. mols. 
MgCl 2 : 
Gm. 
Gm. mols. 
CaCla: 
Gm. 
Gm. mols... . 
KC 1 : 
Gm. 
Gm. mols. 
NaCi: 
Gm. 
Gm. mols. 
OO 
1. 279 
o. 0078 
1- 471 
o. 0108 
O. 361 
o. 0030 
OA 
OB 
IA 
1 
IB 
IIA 
IIB 
IIIA 
IIIB 
IVB 
VB 
1. 279 
0. 007$ 
1. 279 
i 0. 0078 
1. 279 
> 0.0078 
0. 723 
0.0085 
1.471 
0.0108 
1. 279 
0.0072 
i- 454 
1.279 
i 0. 0078 
1.279 
» 0. 0078 
1.279 
1 0. 007? 
1. 279 
1 0.0078 
1. 279 
i 0. 0078 
1. 279 
> 0. 0078 
1.471 
0.0108 
1-471 
0. 0108 
0. 0171 
1. 471 
0. 0108 
1.471 
0.0108 
1.020 
1. 471 
0. 0108 
2. 050 
0. 0x71 
1 i -471 
0.0108 
j 
i 
.1.471 
0.0108 
1. 471 
0.0108 
I. 471 
0. 0108 
0. 0085 
0.3 61 
0. 0030 
0.361 
0.0030 
0.361 
0. 0030 
0. 361 
0. 0030 
0.361 
0. 0030 
0.361 | 
0. 0030; 
l 
o- 361 
0.0030 
0.361 
0.0030 
0.361 
0.0030 
0. 361 
0. 0030 
. 
_ j 
} 
1 
. \ 
....... 1 
. 
1. 896 
0.0171 
I. 629 
O. 0171 
’i 
0.634 
1. 274 
0. 0171 
0. 500 
i- 000 . 
! 
| 
0.0085 
0. 0085 
0. 0171 . 
A further modification of the basic solution was prepared by adding 
.NaU m the same molecular proportions as in the case of those salts of 
direct nutrient value in order to produce an osmotically equivalent 5 
for bUt the ^^0f^Tw„^7s„ru7,„„s 
