4 Wa 
Youn: Around, Botoonina nk (Cheyanne 
Shading 
Use a good durable Black Cloth which when applied will reduce the light intensity to 2 foot candles 
or less. More light intensity than this will result in delayed flowering and unevenness of bloom. 
The cloth should be removed at 5 P.M. and removed at 8 A.M. Continue covering each evening on 
pompons until the latest buds show color and most of the flowers are well developed. For large flower- 
ing varieties shading can be discontinued after all flowering buds have attained the diameter of 
approximately one-half inch. 
Be sure that covering is complete on all benches shaded, as any leaks in light will cause uneven spots 
in the bench at blooming time. 
Black cloth should be applied each evening although missing one night a week will give fair results but 
delayed flowering results when cloth is not applied each evening. 
Temperature Control 
For bud formation a minimum temperature of 60-65 degrees should be maintained. During the growing 
period a night temperature near 60 degrees is ideal. When black cloth treatment is started raise 
the night temperature to 60 until color shows and then drop to 52 to 55 degrees. Excessive high 
temperatures prohibit the bud development and during seasons of night temperatures above 90 de- 
grees it is suggested that the black cloth be raised after sunset and lowered again in the morning 
before daylight. This cooler temperature hastens the development of the buds. 
Temperature regulation becomes a problem to the grower who is growing a single bench of chrysan- 
themums in a cool house. A simple method is to apply black cloth, allowing the cloth to drop to the 
floor on each side of the bench and then turn on the heat lines under the bench. This will trap the 
heat under the cloth and raise the temperature sufficiently to set buds. 
Interrupted Lighting 
You get quality when you control the spray formation in pompons. The control is easy. It will give you 
no more work but does take a little more planning. The control gives you a spray with a more open 
head. The spray is more uniform. The flowers are larger and the color is more intense. 
In timing a crop which is to receive an interrupted lighting treatment, we must start the short day 
treatment earlier than normally, advancing the date by the number of long days which will be used 
to interrupt the short day period. For example, if the short day treatment were to start on January 15 
and continue to flowering. The interrupted lighting treatment is set up for 10 short days followed by 
10 long days. Short days would be given the plants from January 5 to 15 followed by 10 long days 
until January 25 and then short days to flowering. Remember that the total number of long days is 
the same as given in the schedule. 
Use Interrupted Lighting Only on 8, 9, and 10 Week Response Varieties 
Week response Number of short days followed by 10 long days 
8 week 9 short days 
-9 week 10 short days 
10 week 11 short days — 
An interrupted lighting treatment of 10 short days, 10 long days, then short days to flowering has made 
it possible to improve the quality of pompons by improving He spray formation; now this same treat- 
ment can be used on certain standard varieties where quality is poor because of open centers. Best 
to try interrupted lighting on a limited scale until you know how to handle this treatment. 
Much research on interrupted lighting is now being done to find the exact number of short days and 
long days for each response group. We feel that this information is very valuable for growers who use 
the continuous flowering schedule. Our representatives will know the outcome. Ask them to talk it over 
with you. 
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