Forage yields and carrying capacity.-Forage production
was estimated from caged clipping plots. While the procedure
does not duplicate harvesting of forage by cattle, and individual
plots are associated with a large sampling error, results from
adequate numbers of plots are a valuable tool in assessing levels
of forage production. Estimated oven-dry yields from clover-
grass pastures fertilized at the rate of 300 to 600 pounds of
0-10-20 annually were 7,963, 6,873, and 6,496 pounds, respec-
tively, for the three successive phases. These results indicate a
decline in production of 18%o associated with the loss of Pangola-
digitgrass, followed by a small decline thereafter.
 Carrying capacity of the pastures for cattle was estimated
annually on the basis of previous experience in grazing the pro-
gram. The pastures were stocked accordingly at the beginning
of each breeding season. The assigned number of cattle remained
on the program until all of the grazable forage was utilized in
the fall. This method while subjective was successful in achieving
approximately uniform grazing pressure on all programs and
utilizing accumulated forage by approximately December 1.
Good clover production and cattle performance with minimal
wastage of feed were achieved by the procedure. On the above
basis, the number of acres required per cow (including calves
and sires) was 1.25 for phase 1, 1.39 for phase 2, and 1.35 for
phase 3. Thus, the two methods used for evaluating forage yields
were in general agreement that production declined with the loss
of Pangoladigitgrass from the pastures but remained relatively
constant during Phases 2 and 3. This would indicate that, while
seriously detracting from the appearance of pastures, the en-
croachment of smutgrass during Phase 3 had not seriously
affected forage yields by the end of the trial. This appears a
reasonable result, since smutgrass was grazed readily by the
cattle during spring months and apparently to some extent dur-
ing the fall. Some of the invaded areas should be continued under
grazing for a number of years. It may prove to be more practical
to graze a natural balance of stands including smutgrass than to
go to the expense of attempting periodic eradication.
 Performance of cattle.-One of the most significant re-
 sponses observed in the study was that an increase in annual
 production per cow from 225 pounds in Phase 1 to 448 pounds
 in Phase 3. The performance of typical foundation females re-
 vealed a tendency to calve during alternate years. Demonstration
 that this tendency could be alleviated through culling of non-
 pregnant cows, cross-breeding, and use of good bulls, in com-