FLORIDA STATE HORTICULTURAL SOCIETY 
31 
County. This is an especially favorable 
locality for this treatment. The perma¬ 
nent water table is little if any over two 
feet from the surface so nematodes can¬ 
not go very deep into the ground, and the 
system of sub-irrigation, with which the 
truck farms are provided, enables the 
grower to thoroughly saturate the soil at 
any time he may wish. 
The material was used at the rate of a 
ton per acre. Half of it was plowed under 
and the other half spread over the land 
and thoroughly disked in. The material 
was applied with a fertilizer spreader thus 
insuring a very uniform distribution. The 
land was thoroughly irrigated immediate¬ 
ly after the disking was completed. Cel¬ 
ery and lettuce were planted on these 
plots about a month later. 
The experiments were highly success¬ 
ful. On two of the treated seed beds the 
nematodes were apparently entirely exter¬ 
minated. The previous year these had 
been so severely infested that the owners 
had decided to abandon them. A careful 
search at the time the celery and lettuce 
was being transplanted, failed to reveal 
a single knot and the plants all looked 
healthy. Untreated seed beds situated 
only a few rods away were seriously in¬ 
fested with nematodes. 
On a third treated bed, there were a 
few infested spots. These could readily 
be detected from the stunted yellow plants 
they bore. They were all on portions of 
the bed which were a little higher than 
the remainder, suggesting that perhaps 
they were not thoroughly wet after the 
application of the cyanamid. 
A fourth seed bed was treated but not 
according to directions. Instead of plow¬ 
ing half of the cyanamid under it was all 
put on after the ground was plowed and 
disked in. The results paralleled those 
mentioned above with cowpeas. The roots 
near the surface were free of knots but 
some of these that extended to a depth of 
five inches or more showed some. 
CONCLUSION 
The results of these representative ex¬ 
periments, in connection with others 
which showed similar results, but into 
the details of which it is not necessary to 
go here, justify the following conclusion. 
Cyanamid applied at rates of from one to 
three tons per acre, according to the na¬ 
ture and the depth to which the soil is 
infected, and thoroughly mixed with the 
soil, reduces the number of nematodes 
present to such an extent as to render it 
possible to grow with profit susceptible 
plants on land on which, before treatment, 
it was not possible to do so. The reduc¬ 
tion, in some cases, amounted to apparent 
extermination. 
The thoroughness of the control will 
depend upon several factors. The dosage 
is, of course, one of the most important. 
This will depend much upon the depth of 
the soil or the depth to which the nema¬ 
todes extend. The character of the soil, 
apparently, is also important. In one 
case a dosage of ton per acre on the 
very light sandy, pineapple soils (old es¬ 
tablished dunes) about Fort Pierce, seem 
to have produced as good results as 2 or 
3 tons on the Station farm at Gainesville. 
The manner of application is a very 
important factor. Cyanamid does not 
penetrate the soil to any considerable 
depth even when it is in solution. It is 
