Florida Agricultural Experiment Station


 quently have to be applied at a higher rate per acre. If
 basic slag is used, ammonium sulfate should not be used
 as the nitrogen source. The potash should be applied as
 the muriate, although either the sulfate or hardwood ashes
 are quite suitable if they are on hand.
 This fertilizer application should be made not less than
 three days prior to the setting of the plants, and should be
 disked and floated to mix the soil and fertilizer, and to level
 the field for planting.
2. For sawgrass peat soils which have been previously fertilized
 and planted to truck crops other than celery.
 Apply broadcast 3,000 pounds of a 3-6-12 (or its equiva-
 lent) fertilizer composed of the same materials mentioned
 above and in a manner similar to that suggested above. If
 copper sprays or dusts have been used on the previous crops,
 or if copper has been added to fertilizers previously used
 on the land, no copper need be applied. Otherwise, add 100
 pounds of copper sulfate with the fertilizer. If manganese
 has been previously added to the soil, apply only 25 pounds
 per acre of manganese sulfate. If no manganese has been
 used previously, 100 pounds per acre should be added. If
 zinc has been used previously, 10 to 15 pounds of zinc sulfate
 should be sufficient. If none has been used before, 25 pounds
 per acre, applied with the fertilizer, is suggested.
3. For sawgrass peat soils previously fertilized for and planted
 to celery.
 If either of the programs suggested above, or their ap-
 proximate equivalent, had been followed the previous year,
 and if the celery strippings had been returned to the soil
 and no market crop grown since the previous celery crop,
 it is suggested that 2,000 pounds of a 3-6-12 (or its equiva-
 lent) fertilizer per acre be applied broadcast, plus 25 pounds
 of manganese sulfate and 10 to 15 pounds of zinc sulfate
 per acre. If the strippings of the previous crop had been
 removed, or if the previous year's celery crop has been fol-
 lowed by another market crop, 3,000 to 4,000 pounds of the
 same formula fertilizer will probably be required for a good
 crop of celery.
 The above three suggested programs should not require the
 use of additional side-dressing in a normal winter season. If
 unseasonably wet and cold weather occurs at some time during
 the growing period, it is suggested that a side-dressing of 200
 pounds per acre of nitrate of soda or nitrate of potash be applied
 to unburned soils, or 200 pounds per acre of sulfate of ammonia
 to neutral or slightly alkaline burned soils. This should not be