FLORIDA STATE HORTICULTURAL SOCIETY 
33 
TIME BETWEEN TREATMENT AND 
PLANTING 
The length of time which must elapse 
between the application of the cyanamide 
and the planting of the crop will, of course, 
be directly proportional to the dosage. 
The manner of application also influ¬ 
ences the length of time required. Thor¬ 
ough mixing with the soil to as great a 
depth as is practicable also shortens the 
time. Lumps of cyanamid may injure 
plants in their immediate vicinity for 
months. As stated above, a thorough ir¬ 
rigation immediately after application is 
a very important factor in lessening the 
time the land must remain idle. The soil 
should not be allowed to become dry for 
weeks after the material is applied. 
Scorching is always more severe when 
the soil becomes dry. 
The length of time will also vary mark¬ 
edly with the plant that is used. Some 
plants are much more sensitive to the 
compound than others. Radishes are the 
most tolerant of any plant we have tried 
and tomatoes the least so. We expect 
later to be able to state more definitely for 
each crop the minimum length of time 
that must elapse between treatment and 
planting. It is important, in order to get 
the maximum returns from the fertilizer 
value of the cyanamide, to plant as soon 
as possible after treatment. 
In the present state of our knowledge 
the following periods would seem to be 
fairly safe when the dosage is not over 
one ton per acre, thoroughly mixed with 
the soil which is at once thoroughly irri¬ 
gated and kept moist after the seeds are 
planted. 
Radishes may be planted within a week 
or ten days. Celery, lettuce, rape, pars¬ 
nips, cabbage, cauliflower, collards, water¬ 
melons, corn, peppers, and beans in about 
three weeks. For cowpeas, cucumbers, 
cantaloupes, okra, and Irish potatoes one 
should wait about a month. 
For English peas six months should 
elapse, and for tomatoes at least two 
months. 
In the case of tomatoes one could treat 
the land some months in advance of plant¬ 
ing time, perhaps in the fall for land in¬ 
tended for the spring crop, and in the 
meantime grow on the land some short 
season crop, such as radishes, lettuce, or 
rape. 
The scorching often does not appear 
immediately upon plants grown or set 
out too soon on treated land. They may 
prosper for a week or two and have an 
unusually deep green color and show 
scorching only after the elapse of a week 
or more. If the dosage is much too strong 
for the time intervening, the plants will, 
of course, show scorching at once or fail 
to come up at all. This is especially the 
case with those having small seeds. 
COST. 
At the present time cyanamid retails 
for about $75.00 per ton. To this must 
be added the cost of application. This 
should, however, be but little higher than 
that for any other fertilizer. 
In estimating the cost one must take 
into consideration the value of the ma¬ 
terial as a fertilizer. 
FERTILIZING VALUE. 
As stated above, cyanamid is a very 
rich nitrogenous fertilizer, analyzing as 
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