THE IMPORTANCE OF GOOD SEED 21 
If the isolated plots cannot be secured, the differ- 
ent strains may be tested side by side in separate 
rows, provided some of the original seed is saved 
for future planting. In this case no 
seed would be saved from the test 
plots, since it would show mixture. 
Experienced growers may greatly 
improve the quality of the brush 
they are producing by exercising 
greater care in the selection of seed. 
This is particularly true in localities 
where farmers are growing the 
three different classes of sorghums, 
namely, kafir corn for grain and for- 
age, sweet sorghum for syrup and 
the broom-corn for the brush. 
These different plants hybridize or 
cross with each other quite readily 
when grown in the same or in adja- 
cent fields. Sweet sorghum crossed 
with broom-corn loses much of its 
value for syrup making, and kafir 
corn, when mixed with broom-corn, 
has its value for forage greatly im- 
paired. When broom-corn seed be- 
comes crossed with the other 
Fig. 6. The head 
to the right is 
sorghum, while 
that to the left 
is a good head 
of broom-corn. 
Between the two 
is an intermedi- 
ate form, the re- 
sult of a cross 
between sweet 
sorghum and 
broom-corn. 
sorghums, the quality of the brush will be poor. 
Figure 6 shows three heads selected from a field 
of sorghum being grown for forage on a farm where 
broom-corn is a regular crop. The head shown to: 
the right is a black-seeded sorghum and to the left 
is seen a good head of broom-corn. The head in the 
