TrippleDip
Well-Known Member
Hi,
Has anyone used dap as a top dress? I am just trying to figure out if 1/4 tsp to 1.5 tsp is the correct amount.
Let me start by saying any info posted below comes from Formulas and Suggested Guidelines for Horticultural Use - University of Georgia. The following table is where I get the 1/4 tsp to 1.5 tsp values. Edit: I couldn't get the table formatted nice on mobile, but the relevant items are bolded (1/10th of the amount listed for 10ft of row with plants every foot). Is it even correct to estimate this way or am I going to burn my plants?
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Table 8. Fertilizer conversions for specified square feet and row area
*Any of the materials listed in the first column can be used at the rates shown below.
**High Rates, not desirable in row fertilization, are omitted in the table.
Example: You wish to apply calcium nitrate at the rate of 500 lbs per acre. It weighs approximately 19 oz per pt. For application to 100 ft2, you need 1.2 lb or 1.0 pt.
Has anyone used dap as a top dress? I am just trying to figure out if 1/4 tsp to 1.5 tsp is the correct amount.
Let me start by saying any info posted below comes from Formulas and Suggested Guidelines for Horticultural Use - University of Georgia. The following table is where I get the 1/4 tsp to 1.5 tsp values. Edit: I couldn't get the table formatted nice on mobile, but the relevant items are bolded (1/10th of the amount listed for 10ft of row with plants every foot). Is it even correct to estimate this way or am I going to burn my plants?
---
Table 8. Fertilizer conversions for specified square feet and row area
| Material grouped by approximate weight per pint | Recommended rate per acre* | Fertilizer Rate for Specific Areas | ||||||
| 100 sq ft | 1000 sq ft | 10 sq ft | 100 sq ft | Per 10 feet of row spaced** | ||||
| 1 ft | 2 ft | 3 ft | ||||||
| lb | lb | lb | tbs | pt | tbs | tbs | cup | |
| 10 oz per pint | ||||||||
| Sulfur or Dried Blood | 100 | 0.2 | 2.3 | 1.2 | 0.4 | 1.2 | 2.4 | 0.2 |
| 500 | 1.2 | 11.5 | 6.0 | 1.9 | 6.0 | 12.0 | 1.1 | |
| 1000 | 2.3 | 23.0 | 12.0 | 3.7 | — | — | — | |
| 13 oz per pint | ||||||||
| Urea or Ammonium Nitrate or Ammonium Chloride | 100 | 0.2 | 2.3 | 0.9 | 0.3 | 0.9 | 1.8 | 0.2 |
| 500 | 1.2 | 11.5 | 4.5 | 1.4 | 4.5 | 9.0 | 0.8 | |
| 1000 | 2.3 | 23.0 | 9.0 | 2.8 | — | — | — | |
| 16 oz per pint | ||||||||
| Ammonium Phosphate or Potassium Chloride or Gypsum or Mixed Fertilizers | 100 | 0.2 | 2.3 | 0.7 | 0.2 | 0.7 | 1.4 | 0.1 |
| 500 | 1.2 | 11.5 | 3.5 | 1.2 | 3.5 | 7.0 | 0.7 | |
| 1000 | 2.3 | 23.0 | 7.0 | 2.3 | — | — | — | |
| 19 oz per pint | ||||||||
| Calcium Nitrate or Ammonium Sulfate or Superphosphate | 100 | 0.2 | 2.3 | 0.6 | 0.2 | 0.6 | 1.2 | 0.1 |
| 500 | 1.2 | 11.5 | 3.0 | 1.0 | 3.0 | 6.0 | 0.6 | |
| 1000 | 2.3 | 23.0 | 6.0 | 2.0 | — | — | — | |
| 23 oz per pint | ||||||||
| Ground limestone or Potassium sulfatex | 100 | 0.2 | 2.3 | 0.5 | 0.2 | 0.5 | 1.0 | 0.1 |
| 500 | 1.2 | 11.5 | 2.5 | 0.8 | 2.5 | 5.0 | 0.5 | |
| 1000 | 2.3 | 23.0 | 5.0 | 1.6 | — | — | — | |
| 2000 | 4.6 | 46.0 | 10.0 | 3.2 | — | — | — | |
**High Rates, not desirable in row fertilization, are omitted in the table.
Example: You wish to apply calcium nitrate at the rate of 500 lbs per acre. It weighs approximately 19 oz per pt. For application to 100 ft2, you need 1.2 lb or 1.0 pt.
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