Verify Metering-Field Method

This method simulates actual seeding and therefore is the most accurate verification.

The objective is to cover a specifically calculated area to produce an accurate product sample and thereby verify the actual application rate.

The area covered may be greater than or less than one hectare or one acre depending on the product application rate. Typically, higher application rates will require less area to be covered in order to collect a product sample for rate verification while lower application rates will require a larger area to be covered.

IMPORTANT: Ground speed sensor and tank meters must be calibrated prior to doing field check. Refer to AIR CART SET-UP MODE-CALIBRATE TIRE SENSOR in Operating Machine-Monitor Setup section and AIR CART SET-UP MODE-CALIBRATE METERS in Operating Machine-Monitor Operation section.

1. Determine target application rate for the product in use.

2. Install correct meter segments for desired rate.

3. Make sure there is sufficient product in tank to collect a measurable sample. Product should cover all meter inlets and not be heaped to one side. Half-width disconnect handles must be fully down for accurate rate verification.

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IMPORTANT: BEFORE THE CHECK-If equipped with variable rate, an adequate distance must be seeded to allow variable drive to define a transmission setting for the check.

NOTE: Meter cartridge assembly must be full of product at the start of the procedure.

4. Set transmissions to the recommended transmission setting from rate charts (double the setting if seeding 38 cm [15 in.] rows), then seed a short distance to fill meter cartridge and allow variable drive (if equipped) to define a transmission setting.

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NOTE: Setting scale to "0" (zero) will ensure that measured weight is of collected sample only and does not include the weight of the bag.

5. Hang empty collection bag (A) from scale (B) and set scale to "0" (zero) by turning knob on top of scale.

NOTE: Choose a target weight close to 4.5 kg (10 lb) when attempting to verify rates of light weight product.

Choose a target weight close to 15.8 kg (35 lb) when attempting to verify rates of heavy weight product.

6. Choose a product target sample size between 4.5 kg and 15.8 kg (10 lb and 35 lb) to use in the formula when determining exact course distance for meter verification.

7. Use formula below to calculate exact course distance to drive for meter verification.

METRIC FORMULA for Course Driving Distance:

EXAMPLE:

Sorghum-(7 kg x 10,000 sq m) ÷ (13.7 m x 3.5 kg/hectare) = 1460 m (Course Driving Distance) two hectares worth of seeding

Wheat-(14 kg x 10,000 sq m) ÷ (13.7 m x 83.9 kg/hectare) = 121.6 m (Course Driving Distance) 1/6 of a hectare worth of seeding

ENGLISH FORMULA for Course Driving Distance:

EXAMPLE:

Sorghum-(12.4 lb x 43,560 sq ft) ÷ (45 ft x 3.1 lb/acre) = 3872 ft (Course Driving Distance) four acres worth of seeding

A-Collection Bag
B-Scale

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Wheat-(25 lb x 43,560 sq ft) ÷ (45 ft x 75 lb/acre) = 322 ft (Course Driving Distance) 1/3 of an acre worth of seeding

8. Mark a section of field that equals the Course Driving Distance. If tractor radar has been previously calibrated, it may be used to measure this distance. The following conditions are needed:

• Correct cart tire pressure
• Sufficient product in tanks
• Field ground conditions similar to what actual conditions will be
• Normal seeding speed

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9. From any screen press INFO.

10. From the list given, select Air Cart.

11. From the list given, select Meter Rate Verification.

12. Select which tanks to verify.

13. Follow applicable instructions on screen.

• Turn fan off.

Disconnect fan hydraulic hoses.

NOTE: Before returning to normal operation, ensure slide on stationary double-shoot manifold is in proper position.

• Set slide stop to bottom primaries. (Stationary Double-Shoot only).

  Adjust slide stop and lock into position.

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• Install calibration collection bag.

  Remove cover plate from bottom of manifold and install collection bag.

• Drive at seeding speed for course distance per operator's manual.

  Begin driving at seeding speed towards course. When course starting point is reached, select Start on monitor. When the course ending point is reached, select Stop on monitor.

Collection Bag

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• Weigh product and calculate per operator's manual.

  Remove the collection bag (A) and hang from scale (B).

METRIC FORMULA for Actual Application Rate:

EXAMPLE:

Sorghum-(7 kg x 10,000 sq m) ÷ (13.7 m x 1460 m) = 3.5 kg/hectare (Actual Application)

Wheat-(14 kg x 10,000 sq m) ÷ (13.7 m x 121.6 m) = 83.9 kg/hectare (Actual Application)

ENGLISH FORMULA for Actual Application Rate:

EXAMPLE:

Sorghum-(12.4 lb x 43,560 sq ft) ÷ (45 ft x 3872 ft) = 3.1 lb/acre (Actual Application)

Wheat-(25 lb x 43,560 sq ft) ÷ (45 ft x 322 ft) = 75 lb/acre (Actual Application)

15. If actual calculated application rate is above or below target rate, perform the following:

NOTE: See your John Deere dealer for assistance, if desired.

• Verify transmission setting and meter settings are correct for the product in use.
• Calibrate cart tire sensor. See AIR CART SET-UP MODE-CALIBRATE SENSORS in Operating Machine-Monitor Set-Up section.
• Calibrate meter. See AIR CART SET-UP MODE-CALIBRATE METERS in Operating Machine-Setting Meter Rates section.

A-Collection Bag
B-Scale

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• Verify that monitor is set-up properly.

17. Connect fan hydraulic hoses and return manifolds to normal operating configuration.

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