A Fertility Program for Celery Production


 cast at the rate of one ton per acre before planting gave good
 results). With all subsequent crops larger amounts of potash
 were required. This difference between the first and other years
 is probably only the result of a partially adequate reserve supply
 of potash in previously uncropped soils, or of previous cropping
 with a crop which removes relatively less potash than does
 celery.



 900- (856)
 S00-
 soo-- 789)
 (728)
 700-

 600-
 600 -
 00- 1



 100-


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 Fig. 5.-A comparison of muriate of potash vs. sulfate of potash as reflected by yields
 of celery, per acre, over an eight-year period. For each comparison the amounts of potash
 (K-O) applied were the same. The yield represented by the figures is given in terms of
 the number of field-trimmed crates produced per acre. (Yield data for the five separate
 years which go to make up the five-crop average in Area 2 are listed in Table 6 in the
 appendix.

 It may be readily seen from Figs. 6, 7 and 8 that celery
 grown without potash will be practically a failure on these
 soils. From the economic standpoint this possibility is further
 emphasized-for the five-year average period covered by Table 3
 a return of 65c a crate would have been necessary for the grower
 to break even with celery for this period, in the event that he
 fertilized only with phosphate. The data comprising Table 3
 were calculated in the same way that similar data were treated
 in the previous section on nitrogen fertilizers. It should be
 remembered that both yield per acre and cost and return figures
are based upon field-trimmed crates, rather than crates as
actually shipped from the packinghouse.