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The chemical manufacturer may recommend the rate of application for granular chemicals in the following ways:
1.
Ounces per 1000 linear row feet.
2.
Pounds per acre for a given band width and row spacing.
3.
Pounds per acre for complete (broadcast) coverage.
When the chemical manufacturer recommends ounces per 1000 linear row feet or pounds per acre for a given band width and row spacing, proceed to the chemical manufacturer's recommended meter setting or to the meter setting recommended in the rate charts in this section.
When the chemical manufacturer recommends pounds per acre for complete (broadcast) coverage only, it is necessary to reduce the pounds per acre to apply for your band width and row spacing. This will give you the same chemical concentration in the band area as the chemical manufacturer recommends for complete (broadcast) coverage.
Use the following formula to find the pounds per acre for your band width and row spacing.
NOTE:
We recommend you actually measure the band width applied in your conditions and use this width in your application rate calculations.
A x B C |
= Delivery rate per acre for a given band width and row spacing. |
A-Chemical manufacturers recommended rate in pounds per acre for complete (broadcast) coverage.
B-Band width in inches.
C-Row spacing in inches.
Example: The chemical manufacturer recommends 20 lb/acre for complete broadcast coverage. The
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band width is 356 mm (14 in.). The row spacing is 762 mm (30 in.).
20 x 14 30 |
= 9.3 lb. per acre. |
The required delivery rate for 356 mm (14 in.) bands and 30 in. row spacing would be 9.3 lb/acre. Set meter setting recommended for 9.3 lb/acre broadcast coverage.
Delivery of 9.3 lb/acre of chemical in a 356 mm (14 in.) band will provide the same chemical concentration on the soil surface as delivery of 20 lb/acre broadcast coverage.
Proceed to chemical manufacturer's recommended meter setting or to the meter setting recommended in the rate charts in this section which will deliver 9.3 lb/acre.
To check the exact number of lb/acre of chemical that will be delivered, attach a plastic bag to each chemical diffuser, lower the planter, and proceed as follows:
Drive 500 feet at planting speed. Weigh the chemical in oz. that was caught in one bag. Multiply that amount by the factor shown to determine lb. per acre.
Check the chemical caught in each bag in the same manner.
| Lb. Per Acre Factor for Given Row Width |
| Row Width |
Factor |
| 965 mm (38 In.) |
1.7 |
| 914 mm (36 In.) |
1.8 |
| 762 mm (30 In.) |
2.2 |
Example: Assume you are planting 965 mm (38 in.) rows and you caught 5.6 oz. in one bag (one row). 5.6 oz. times 1.7 (factor for 965 mm (38 in.) rows) equals 9.5 lb. per acre.
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