1921] 
MATSUMOTO—SPECIALIZATION IN RHIZOCTONIA 33 
The highest yield is obtained from potassium nitrate, and the 
combination of potassium nitrate and ammonium nitrate shows 
no better result in mycelial and sclerotial growth than the cul- 
ture which contains either one of these salts. In this experi- 
ment P7 shows the highest growth of any of the cultures used. 
TABLE XXI 
— ed THE STRAINS ON NITRATES. CULTURE bye ? WEEKS 
E QUANTITIES REPRESENT DRY WEIGHTS IN GR 
P1 P4 P7 B1 H B3 
NHNO; .140 .073 .160 . 008 .130 Negl. 
KNO; . 183 TF . 207 .010 .195 | Negl. 
NH,NO;+KNO; . 140 Lost . 136 AUTE .140 Negl. 
TABLE XXII 
GROWTH OF THE STRAINS IN fuse BEET DECOCTION AND INORGANIC 
SOURCES OF NITROGEN. THE DECIMAL QUANTITIES REPRESENT 
DRY WEIGHT IN GRAMS 
Sugar beet decoction plus 1/100 M. 
Sugar beet 
decoction 
only 
Strain Ammonium Ammonium Potassium 
sulphate nitrate nitrate 
Mycl. | Sel. | Mycl. | Scl. | Mycl. | Scl. | Mycl. | Scl. 
FI .242 2 .172 2 .204 3 .246 2 
P4 .062 1 .084 1 .127 1 .237 3 
P7 .185 0 185 0 .252 0 116 0 
B1 .225 2 .233 2 .223 3 .242 2 
H .248 2 .198 2 .226 3 .242 2 
B3 .145 1 .028 0 . 060 0 .060 0 
After conducting a series of experiments in which (NH,),SO,, 
NH,NO,, and KNO, in concentrations of M/100 and M/500 
were added to sugar beet decoction and the strains grown for 
10 days without any apparent advantage from the addition of 
