Weights and Measures
Liquid
1 mililiter (ml) = 1 cubic centimeter (cc)
1 teaspoon (tsp) = 5 milliliter (ml)
3 teaspoons (tsp) = 1 tablespoon (Tbsp)
1 tablespoon (Tbsp) = 15 milliliter (ml)
2 tablespoons (Tbsp) = 1 ounces (oz)
16 tablespoons (Tbsp) = 1 cup (c.)
1 cup (c.) = 8 ounces (oz)
2 cups (c.) = 1 pint (pt)
1 pint (pt) = 16 ounces (oz)
2 pints (pt) = 1 quart (qt)
8 pints (pt) = 1 gallon (gal)
1 gallon (gal) = 128 ounces (oz)
1 gallon (gal) = 3785 mililiters (ml)
Weight
1 ounce (oz) = 28.4 grams (gm)
16 ounces (oz) = 1 pound (lb)
1 pound (lb) = 454 grams (gm)
1 kilogram (kg) = 2.2 pounds (lbs)
Length and Area
1 mile (mi) = 5,280 feet (ft)
1 mile (mi) = 320 rods
1 rod = 16.5 feet (ft)
1 mile (mi) = 1.6 kilometers (K)
1 acre (A) = 43,560 square feet (sq ft)
1 square rod (sq rod) = 272.3 square feet (sq ft)
1 acre (A) = 160 square rods (sq rod)
Pints of Commercial Material Needed Per Acre
for given amounts of active ingredient (ai)
|
lb ai/gal of commercial material |
Recommended rate in pounds of active ingredient per acre (lbs of ai/A) |
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|
0.25 |
0.5 |
0.75 |
1.0 |
1.5 |
2.0 |
|
|
Pints of commercial material per acre |
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|
1.00 |
2 |
4 |
6 |
8 |
12 |
16 |
|
2.00 |
1 |
2 |
3 |
4 |
6 |
8 |
|
2.64 |
0.75 |
1.5 |
2.25 |
3 |
4.5 |
6 |
|
3.00 |
0.7 |
1.33 |
2 |
2.7 |
4 |
5.33 |
|
3.34 |
0.6 |
1.2 |
1.8 |
2.4 |
3.6 |
4.8 |
|
4.00 |
0.5 |
1 |
1.5 |
2 |
3 |
4 |
|
5.00 |
0.4 |
0.8 |
1.2 |
1.6 |
2.4 |
3.2 |
|
6.00 |
0.33 |
0.7 |
1 |
1.33 |
2 |
2.7 |
|
6.70 |
0.3 |
0.6 |
0.9 |
1.2 |
1.8 |
2.4 |
|
7.00 |
0.29 |
0.57 |
0.87 |
1.14 |
1.7 |
2.3 |
|
8.00 |
0.25 |
0.5 |
0.75 |
1.0 |
1.5 |
2.0 |
Amount of Chemical Needed
for 1 sq rod and 1,000 sq ft
Applied at the rate of 1 lb of ai/A
|
Liquid |
||
|
lb ai/gal |
milliliters (ml) |
|
|
per sq rod |
per 1,000 sq ft |
|
|
0.67 |
35 |
130 |
|
1.00 |
24 |
87 |
|
1.50 |
16 |
58 |
|
2.00 |
12 |
43 |
|
2.50 |
10 |
35 |
|
3.00 |
8 |
29 |
|
3.34 |
7 |
26 |
|
4.00 |
6 |
22 |
|
6.00 |
4 |
14 |
|
7.00 |
3.5 |
12 |
|
Dry |
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|
percent (%) ai |
grams (g) |
|
|
per sq rod |
per 1,000 sq ft |
|
|
100 |
2.8 |
10 |
|
90 |
3.1 |
12 |
|
80 |
3.5 |
13 |
|
75 |
3.8 |
14 |
|
70 |
4.0 |
15 |
|
65 |
4.4 |
16 |
|
60 |
4.7 |
17 |
|
50 |
5.6 |
21 |
|
40 |
7.0 |
26 |
|
30 |
9.4 |
35 |
|
20 |
14.1 |
52 |
|
10 |
28.3 |
104 |
|
5 |
56.6 |
208 |
|
4 |
71.0 |
261 |
|
3 |
94.6 |
347 |
|
2 |
142.0 |
521 |
|
1 |
284.0 |
1,042 |
How to Determine the Amount of Herbicide Needed
If rate is recommended for
Liquid commercial product:
Rate of product/acre x acres treated = total volume
Example: 1.5 pt/A x 20 A = 30 pt product
30 pt ÷ 8 pt/gal = 3.75 gal product
If rate is recommended as
Active ingredient (ai) for liquid product:
Rate of ai/A ÷ lb ai/gal product = gal product/A
Gal product/A x A treated = total gallons product
Example: 0.5 lb ai ÷ 4 lb ai/gal = 0.125 gal/A
0.125 gal/A x 20 A = 2.5 gal product
If rate is recommended for
A dry commercial product:
Rate of product/A x A treated = total weight
Example: 15 lb/A x 50 A = 750 lb product
If rate is recommended as
Active ingredient (ai) for a dry product
Rate of ai/A ÷ lb ai/lb product = lb product/A
lb product/A x acres = total weight
Example: 2 lb ai/A ÷ 0.8 lb ai/lb product = 2.5 lb product/A
2.5 lb/A x 30 A = 75 lb product
Method for Applying Correct Amount of Spray Solution per Acre
|
To determine the spray volume of a hydraulic sprayer, use the following short-cut calibration formulas. |
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|
1. Determine application speed in miles per hour (mph) |
mph = (feet traveled ÷ time in seconds) x 0.6818 |
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|
2. Determine nozzle output in gallons/minute (gal/min) |
gal/min = ounces collected ÷ (2.13 x seconds) |
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3. Determine sprayer output in gallons/acre (gal/A) |
gal/A = [(5,940 x gal/min per nozzle) ÷ (nozzle spacing in inches x mph)] |
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* Based on 2,4 D formulation with a 4 lb acid equivalent (ae)/gal |
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Teaspoon Volume Equivalents To prepare one gallon of spray solution (using standard kitchen measuring spoons, level measure) |
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Chemical |
Rate per Acre |
Volume water per Acre |
Tablespoons of chemical for |
|
2,4 D amine * |
3 pint (1.5 lb) |
50 gallons |
2.0 |
|
2,4 D amine * |
1 pint (0.5 lb) |
10 gallons |
3.2 |
|
2,4 D low-volatile ester * |
3 pint (1.5 lb) |
50 gallons |
2.0 |
|
2.4 D low-volatile ester * |
1 pint (0.5 lb) |
10 gallons |
3.2 |
|
glyphosate |
2 quart (1.5 lb) |
50 gallons |
2.6 |
|
naptalam |
2 gallons (4.0 lb) |
50 gallons |
10.2 |