Conversion Charts
General
| To Convert |
Into |
Multiply By |
| acres |
rods |
160 |
| acres |
hectare |
0.4047 |
| acres |
sq feet |
43,560 |
| acres |
sq meters |
4,047 |
| acres |
sq miles |
1.562 x 10-3 |
| acre-feet |
cu feet |
43,560 |
| acre-feet |
gallons |
3.259 x 105 |
| atmospheres |
ton/sq inch |
0.007348 |
| atmospheres |
kgs/sq meter |
10,332 |
| atmospheres |
pounds/sq inch |
14.70 |
| bars |
atmospheres |
0.9869 |
| bars |
kgs/sq meter |
1.020 x 104 |
| bars |
pounds/sq ft |
2,089 |
| bushels |
cu ft |
1.2445 |
| bushels |
cu meters |
0.03524 |
| bushels |
liters |
35.24 |
| bushels |
pecks |
4.0 |
| bushels (60 lbs)/acre |
kilograms/hectare |
67.26 |
| centigrade |
fahrenheit |
(Cº x 9/5) + 32 |
| centimeters |
inches |
0.3937 |
| centimeters |
meters |
0.01 |
| centimeters |
miles |
393.7 |
| centimeters of mercury |
atmospheres |
0.01316 |
| circumference |
radians |
6.283 |
| cubic feet |
cu meters |
0.02832 |
| cubic feet |
gallons |
7.48052 |
| cubic feet |
liters |
28.32 |
| cubic feet/min |
gallons/sec |
0.1247 |
| cubic feet/min |
liters/sec |
0.4720 |
| cubic meters |
gallons |
264.2 |
| cubic meters |
liters |
1,000 |
| cubic meters/hectare |
cubic ft/acre |
14.2916 |
| fathom |
meter |
1.828804 |
| fathom |
feet |
6.0 |
| feet |
meter |
0.3048 |
| feet/sec |
kms/hr |
1.097 |
| feet/sec |
miles/hr |
0.6818 |
| footcandle |
lumen/sq meter |
10.764 |
| furlongs |
miles |
0.125 |
| gallons |
liters |
3.785 |
| gallons/acre |
liters/hectare |
9.354 |
| gallons |
pounds of water |
8.3453. |
| gallons/min |
cu ft/sec |
2,228 x 10-3 |
| gallons/min |
liters/sec |
0.06308 |
| grams |
ounces (avdp) |
0.03527 |
| grain |
grams |
0.648 |
| grams |
pounds |
2.205 x 10-3 |
| grams/hectare |
ounces/acre |
0.01428 |
| grams ai/hectare |
pounds ai/acre |
0.00089 |
| grams/liter |
pounds/1000 gal |
8.345 |
| grams/liter |
parts/million |
1,000 |
| grams/liter |
pounds/gallon |
0.008 |
| hectares |
acres |
2.471 |
| hundredweight/acre |
kilograms/hectare |
125.6 |
| inches |
centimeters |
2.54 |
| inches of mercury |
atmospheres |
0.03342 |
| kilograms |
pounds |
2.205 |
| kilograms/hectare |
pounds/acre |
0.8922 |
| kilometer |
miles |
0.6214 |
| knots |
kilometer/hr |
1.8532 |
| knots |
miles/hr |
1.151 |
| litre/hectare |
fluid ounces/acre |
13.68 |
| liter/hectare |
gallons/acre |
0.1069 |
| liters |
gallons |
0.2642 |
| meter |
inches |
39.37 |
| meters |
feet |
3.281 |
| meters/sec |
kilometers/hr |
3.6 |
| meters/sec |
miles/hr |
2.237 |
| miles |
feet |
5,280 |
| miles |
kilometers |
1.609 |
| ounces |
grams |
28.349527 |
| ounces |
pounds |
0.0625 |
| ounces (fluid) |
liters |
0.02957 |
| ounces (fluid) |
milliliters |
29.573 |
| quarts |
liters |
0.9463 |
| peck (U.S.) |
bushels |
0.25 |
| pint |
liter |
0.4732 |
| pounds |
grams |
453.5924 |
| pounds |
kilograms |
0.4536 |
| pounds of water |
gallons |
0.1198 |
| pounds/acre |
kilograms/hectare |
1.121 |
| pound/gallon |
gram/liter |
119.8 |
| rods |
feet |
16.5 |
| sq centimeters |
sq inches |
0.155 |
| sq feet |
sq meters |
0.093 |
| sq feet |
sq yards |
0.1111 |
| sq kilometers |
acres |
247.1 |
| sq kilometers |
sq miles |
0.3861 |
| sq meters |
sq feet |
10.76 |
| sq miles |
acres |
640.0 |
| sq miles |
sq kilometers |
2.59 |
| sq yards |
sq feet |
9.0 |
| sq yards |
sq meters |
0.8361 |
| temperature (Cº) + 17.78 |
temperature (Fº) |
1.8 |
| temperature (Fº) - 32 |
temperature (Cº) |
0.56 |
| tons (metric) |
kilograms |
1,000 |
| tons (metric) |
pounds |
2,205 |
| tons |
tons (metric) |
0.9078 |
| ton (2,000 lbs)/acre |
metric tons/hectare |
2.242 |
| yards |
meters |
0.9144 |
Metrics in Weed Control
Conversion Factors Common to Weed Control
(ha) Hectares = Acres X 0.405
(kPa) Kilo Pascals = Pounds per square inch x 6.9
(km/h) Kilometers per hour = Miles per hour x 1.61
Bench Marks
16 hectares = 40 acres
64 hectares = 160 acres
200 kilo Pascals = 29 pounds per square inch
250 kilo Pascals = 36 pounds per square inch
275 kilo Pascals = 40 pounds per square inch
300 kilo Pascals = 43 pounds per square inch
4.8 km/h = 3 mph
6.4 km/h = 4 mph
8.0 km/h = 5 mph
9.5 km/h = 6 mph
1 gallon per acre = 9.35 liters per hectare
1 mile = 5,280 feet = 1,610 meters = 1.61 kilometers
Pressure
1 foot lift of water = 0.433 pound pressure per square inch (psi)
1 pound pressure per square inch will lift water 2.31 feet
1 atmosphere = 760 millimeters of mercury; 14.7 pounds; 33.9 feet of water
1 pound per square inch (psi) = 0.070 kg/cm² or 6.895 kPa (kilopascal)
Length of Row Required for One Acre
| Row Spacing |
Length or Distance |
| 24 in. |
7,260 yards = 21,780 ft. |
| 30 in. |
5,808 yards = 17,424 ft. |
| 36 in. |
4,840 yards = 14,520 ft. |
| 42 in. |
4,149 yards = 12,445 ft. |
| 48 in. |
3,630 yards = 10,890 ft. |
Rates of Flow for Calibrating Spray Tips
| GPM |
Seconds to
Collect 1 Quart |
GMP |
Seconds to
Collect 1 Quart |
| 0.05 |
300 |
0.20 |
75 |
| 0.06 |
250 |
0.225 |
67 |
| 0.07 |
214 |
0.25 |
60 |
| 0.08 |
188 |
0.30 |
50 |
| 0.09 |
167 |
0.35 |
43 |
| 0.10 |
150 |
0.40 |
38 |
| 0.11 |
136 |
0.50 |
30 |
| 1.12 |
125 |
0.60 |
25 |
| 0.13 |
115 |
0.70 |
21 |
| 0.14 |
107 |
0.80 |
19 |
| 0.15 |
100 |
0.90 |
17 |
| 0.17 |
88 |
1.00 |
15 |
Useful Formulas
GPM = GPA x MPH x W*
(Per Nozzle) 5,940
GPA = 5,940 x GPM (Per Nozzle)
MPH x W*
*W – Nozzle spacing (in boom spraying) or spray swath (in boomless spraying); in inches.
Tractor Speeds
| Speed in MPH |
Time required in Seconds to Travel a Distance of: |
| (Miles per hour) |
100 feet |
200 feet |
300 feet |
| 3.0 |
23.0 |
45.0 |
68.0 |
| 3.5 |
20.0 |
39.0 |
58.0 |
| 4.0 |
17.0 |
34.0 |
51.0 |
| 4.5 |
15.0 |
30.0 |
45.0 |
| 5.0 |
14.0 |
27.0 |
41.0 |
| 6.0 |
11.0 |
23.0 |
34.0 |
| 7.0 |
9.7 |
19.0 |
29.0 |
| 7.5 |
9.0 |
18.0 |
27.0 |
| 8.0 |
8.5 |
17.0 |
26.0 |
| 9.0 |
7.6 |
15.0 |
23.0 |
| 10.0 |
6.8 |
14.0 |
20.0 |
| 12.0 |
5.7 |
11.0 |
17.0 |
| 15.0 |
4.5 |
9.0 |
13.6 |
| 20.0 |
3.4 |
6.8 |
10.2 |
Standard lbs per Bushel
| Barley |
48 |
Lentils |
60 |
| Feed Bean |
60 |
Oats |
34 |
| Canola |
50 |
Peas |
60 |
| Chickpeas |
60 |
Rice |
45 |
| Corn Shelled |
56 |
Sorghum |
56 |
| Corn Ear |
70 |
Soybean |
60 |
| Corn Sweet |
50 |
Sunflower |
24 |
| Flax |
56 |
Wheat |
60 |
