Prodiamine Calculator

Prodiamine Application Calculator

Application Results:

Total Prodiamine Needed: 0 oz (0 grams)

Total Water Needed: 0 gallons

Number of Tank Loads: 0

Formula: (Area / 1,000) × Application Rate

function calculateProdiamine() { var area = parseFloat(document.getElementById('lawnArea').value); var rate = parseFloat(document.getElementById('appRate').value); var carrier = parseFloat(document.getElementById('waterCarrier').value); var tank = parseFloat(document.getElementById('tankSize').value); var resultsDiv = document.getElementById('resultsArea'); if (isNaN(area) || isNaN(rate) || isNaN(carrier) || isNaN(tank) || area <= 0 || rate <= 0) { alert('Please enter valid positive numbers for all fields.'); return; } var totalOz = (area / 1000) * rate; var totalGrams = totalOz * 28.3495; var totalWater = (area / 1000) * carrier; var tanksNeeded = totalWater / tank; document.getElementById('resTotalOz').innerText = totalOz.toFixed(2); document.getElementById('resTotalGrams').innerText = totalGrams.toFixed(2); document.getElementById('resTotalWater').innerText = totalWater.toFixed(2); document.getElementById('resTanks').innerText = tanksNeeded.toFixed(1); resultsDiv.style.display = 'block'; }

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Understanding Prodiamine Pre-Emergent Application

Prodiamine is one of the most popular pre-emergent herbicides used by both professionals and homeowners to prevent crabgrass and other grassy weeds. Known commonly under brand names like Barricade, it works by creating a chemical barrier in the soil that prevents weed seeds from successfully germinating.

How to Use the Prodiamine Calculator

To ensure an effective application without exceeding the legal annual limits, you must calculate your dosage based on your specific square footage. Here is how to use the inputs:

• Lawn Area: Measure your turf area in square feet. Do not include driveways or mulch beds.
• Target Rate: This is found on the product label. It usually ranges from 0.185 oz to 0.83 oz per 1,000 square feet for 65 WDG (Water Dispersible Granule) formulations.
• Water Carrier Rate: Most backpack sprayers are calibrated for 1 gallon of water per 1,000 square feet. This ensures even coverage.

Timing is Critical

Prodiamine must be applied before soil temperatures reach certain thresholds. For crabgrass prevention, the general rule is to apply when soil temperatures are consistently around 50°F to 55°F. If you wait until the weeds are visible, the pre-emergent will not work, as it does not kill existing weeds.

Example Calculation

Suppose you have a 5,000 square foot lawn and you want to apply Prodiamine 65 WDG at a rate of 0.37 oz per 1,000 sq ft (a common medium-length residual rate):

1. Total Product: (5,000 / 1,000) × 0.37 = 1.85 ounces.
2. Water Needed: (5,000 / 1,000) × 1 gallon = 5 gallons.
3. Application: You would mix 1.85 oz of Prodiamine into 5 gallons of water and spray it evenly across the 5,000 sq ft area.

Key Tips for Success

1. Calibration: Before mixing the product, practice spraying your lawn with just water to see how much volume you actually use per 1,000 sq ft. This is your "carrier rate."

2. Watering In: Prodiamine requires "incorporation" to work. You must apply at least 0.5 inches of irrigation or rain within 14 days of application to move the chemical into the soil surface.

3. Annual Max: Every grass type has a maximum annual limit for Prodiamine. For example, Kentucky Bluegrass and Fescue typically allow up to 1.5 lbs of active ingredient per acre per year. Always check your specific product label for the "Maximum Annual Rate."