LIMITS OF ENDURANCE OF DIFFERENT FARM CROPS. 165 
POT EXPERIMENTS To DETERMINE THE LIMITS or 
ENDURANCH oF DIFFERENT FARM-CROPS For 
CHRTAIN INJURIOUS SUBSTANCKHS. 
By F. B. GUTHRIE, F.I.C., F.C.S., and R. HELMS. 
[Read before the Royal Society of N. S. Wales, September 2, 1903.] 
Part IJ.—MAIzE. 
THE experiments here recorded are in continuation of 
similar ones with wheat’ and were conducted in precisely 
the same manner. A description of the pots used and the 
manner in which they were filled and treated is fully given 
in the previous paper, and need not be here repeated. Mr. 
Maiden kindly set apart a space in the Botanic Gardens 
for the purpose of the experiments which were conducted 
in all details in the same manner as the preceding ones. 
Nature of Soil.—The soil with which the pots were filled 
was a fairly rich garden loam mixed with nearly an equal 
quantity of a light sand. 
The composition of the mixed soil was as follows:— 
Moisture re ie bye per cent. 
Organic matter gas - 9 Or Le Pe 
Nitrogen sis be oe AU “a 
Soluble in strong HCl. 
Limeo.:. a7 pone Zar i 
Potash... sisi wae IDs 9 
Magnesia Pes dad S42 O69 a 
Phosphoric acid po LO a 
Hach pot received in addition 10 grms of superphosphate. 
Several check-pots were filled in exactly the same way with 
the exception that the deleterious substances were omitted. 
1 This Journ. xxxv1., p. 191. 
