1920] 
DUGGAR——INSOLUBLE SALTS IN BALANCED SOLUTIONS 317 
Green weight 
Wheat 
94 1n grama y 
1 
LI 
22 Lm 
la 
5 4 
20.5 Ea. if 
> f} 1 B E] 
T TELE" B 
, es vg a o n 
4 d 535 $e > $9 ia 
le y ee a, M P A & [^ 
| 13 & JF. ^ Am y ELE 
~ g . fu o [) i d] a " 
uf fi gigi: GARA hg 
a 3 i El + à o A BH 113 = 
M^ LL gg Sighs Jas ea ig SIE + 
vR/2sl|3 B 5 iS E B è » 91453 & 8 > 
ala > B S £ fl? E TIBERIO 
1785 3 o Viel > $ PUNA A 
1019 a. e E z cep ela 1 A H 3 || 3 a 
de 13 t €i(dkixX d 4/3518 di 4 £ 
2|àg 3 (o Spee AR ace 
B pa ó H = fa - o o D 1 
s 3 HLL $ Bj* |» E A 
3 - 3) \ Si g vs s là 2 
6 4 E \ of $ vw à 13 z 
S i, CHp ol 3 
9 ~ \ + 7 
4 e 3 \ is o + 
u & * E & 
ol Culture No, Y ag "à g 
1 9$ 3 4 6b 6 rP GF 2.9 Somers 3à 3 18 11 
Fig. 3. Yield of wheat in solutions of relatively insoluble salts. Continuous 
line is concentration 1 and broken line concentration 11 (see table 11). 
as in “1,” the quantity of the iron salt is reduced to one-half. 
The concentration of KNO, was the same as in the experiments 
given in table 1. The stock solution of MgSO, contained 41.932 
grams of the salt in 1 liter of water, so that 10 cc. per culture 
of 240 cc. gave a solution two-thirds as strong in MgSO, as the 
R.C, of Livingston and Tottingham (718). In almost every 
instance where the growth quantities are small the lower concen- 
trations of the potassium nitrate and of the magnesium sulphate 
have a tendency within the same culture number to promote the 
greater growth. In this series the best culture containing in- 
soluble salts is No. 6 (CaSO, [solid phase present], MgNH,PO,, 
soluble ferric phosphate, and KNO,), followed closely by cul- 
ture 2, the latter being the same that proved so satisfactory in 
the previous series. 
As will be pointed out later, the more insoluble calcium salts 
give the higher yields when in combination with relatively in- 
soluble salts of magnesium. This is true except in certain cases 
where iron citrate enters into the combination. In certain cul- 
