10 Florida Agricultural Experiment Stations


in such an assessment, a study was made of the data in Figure
1. Two hundred and seventy-five pounds of total digestible nu-
trients biweekly from the pasture (represented by the base
line) was considered to be a reasonable uniform level to employ
in calculating the approximate maximum acreage of unirrigated
pasture to grow. A level of 300 pounds of total digestible nu-
trients biweekly (not shown in the figure) appeared to be logi-


RAINFALL
 IN.


1954-55


 I- RRIGATED --BASE LINE
----- UNIRRIGATED "- k
 11 I
 RAINFALL I --
 -- .V. 5.
 \ ,, \

,.. I I I I 1 I I I


1955-56


1956-57


 1959-60
 900-
 800- / \
 oo-
 700-
 600 -
 00-I
 500 -
 500 --
 00 __. ._._._._. .. .. ...-.-
 200- ---

 NOV. I DEC. JAN. I FED. I MAR.I APR. I MAY I JUNE I JULY AUG. SEPT.


Fig. 1.-Total digestible nutrients obtained biweekly per acre from alfalfa-
 oat-clover pasture. Rainfall is shown by three-day periods.