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If you are using the Vigoro Ultra Turf Lawn Fertilizer(29-0-4) with the Scotts Standard Broadcast Spreader then the setting would be 5.
It's on the bag
The recommended setting would be 3
The spreader setting for Scotts Southern Turf Builder when using the EZ Broadcast spreader by Republic is 3.5. If you are using the EZ Drop Spreader by Republic the spreader setting is 6.5.
A broadcast spreader is used to spread seed, fertilizer or sand over a large area. It is commonly used on farms and is an alternative to using a drop spreader.
I would go with a broadcast spreader and use dry fertilizer , might be safer than using liquid fertilizer with a sprayer.
Set the Scott's Speedy Green 1000 spreader to the recommended setting for the 20-1-4 Naturlawn nutrient as indicated on the product packaging or by using a calibration test. Apply the fertilizer evenly over your lawn, ensuring to follow all safety and usage instructions provided.
Use number 4.5 to 5.0
You would want to use spreader setting 3.25
The spreader can be cooled in a refrigerator for a few minutes before using it for spreading in microbiology. This helps prevent the agar from melting upon contact with the spreader and ensures an even spread of the sample. It is important to not leave the spreader in the refrigerator for too long to avoid excessive cooling.
Most fertilizers will contain some amount of phosphates and nitrates. Both of which are food for algae. The best method is to have the fertilizer applied using a drop spreader (not a rotary spreader). Water the fertilizer into the lawn/garden areas. Prevent walking on the fertilized area for several days. If phosphates get high in the pool/spa then you can use a phosphate remover to lower the quantity in the water.
I spread 10,000 sq-ft of ACE Green Turf over about 12,000 sq-ft of lawn using my Republic rotary broadcast spreader. I used a setting of 4 for the front yard (which was too much) and 2.5 in the back yard (which was too little). So, I'm thinking the right setting was about 3. Not very scientific, hope this helps...