Florida Agricultural Experiment Station


 Figure 4 represents comparisons between fertilizers with and
 without nitrogen with respect to yields of celery over an eight-
 year period at the Everglades Experiment Station. In each
 comparison represented the only difference in treatment in the
 entire growing period of the crop was in the amount of nitrogen
 included in the fertilizer mixture. The smallest response to
 nitrogen in the period represented by the graph occurred in
 the 1936-37 crop on Area 3. The low yields of this year appar-
 ently were caused by two factors-the extremely dry condition
 of the surface soil when the plants were set, which necessitated
 a resetting of much of the area, and constant rains shortly after
 the plants had finally become well established, which kept the
 soil water-logged for more than a week. This crop was not set
 to the field until early February, and rains were abnormally
 early.

 1,:,.. -



 COO .

 _O,, l, s ho
 l i-,l) 1p ---ra






 1. II 11 11






data for the five separate years which go to make up the five-crop average in Area 2 are
listed in Table 5 in the appendix.)

 The comparison of the 0-41/2-61 vs. the 3-41/-6 with respect
to yields is represented at the extreme left of Figure 4 for the
single year 1930-31. This was a preliminary test and was some-
what modified for the subsequent five-year period.
 1 0-42%-6 = 0% Nitrogen, 412%% POs, 6% KO.