-6 
UNIVERSITY OF FLORIDA 
IlilllllliililllliP I 
3 1262 09242 9355 
Table 1. --Separation of red clover seed passed through separator at 
various slide settings. 
Slide 
setting 
No. 
Percent of 
total open- 
ing to fan 
Total number 
of cleaned 
seeds 
Percent of 
original seeds 
found in refuse 
Good Poor 
Remarks 
5 
10 
4,101 


All fine chaff removed 
4 
29 
3,830 
.3 
33 
Some coarse chaff 
remained 
3 
50 
3,451 
.7 
76 
Practically all chaff 
removed 
2 
71 
2,945 
11 
94 
All chaff removed 
1 
89 
2,124 
36 
98 

100 
1,759 
46 
100 
All small seeds 
removed 
In each separation of these samples, except at the minimum slide 
setting of 5, some seed was carried over in the chaff. The quantity 
increased with the air velocity until at maximum velocity all the poor 
seeds and nearly half of the good seeds were carried over. At the 3 
setting 76 percent of the poor seeds were removed; 94 percent of the 
cleaned seed was good, but because of the small size and light weight 
of the poor seeds, they made up only 4 percent of the weight of the 
cleaned seed. Although a setting of 2 reduced the number of poor seeds 
to only 2 percent, it removed 11 percent of the good seeds. 
Because of variations in weight of seed, it is to be expected that 
results will vary from those given for these two samples. In actual use, 
the 5 setting is used to remove the dust and then the 3 setting with the 
screen in place is used to finish the cleaning. Samples of about 1 gram 
each of cleaned seed and of refuse are then examined under a microscope 
for the evaluation of pollination resulting in small seeds and of insect 
damage, as well as other factors. Seeds damaged by the clover seed 
chalcid (Bruchophagus gibbus (Boh.)) are easily separated with the 3 
setting, but many seeds of this type are crushed in threshing and cannot 
be identified. 
