Have you ever wonder why herbicides labels contains only the recommended liters to be applied per hectare and not the quantity you should put in your knapsack sprayer tank? This is because Mr A might spray an hectare with 20 tank loads of a sprayer, while Mr B might require just 10.

The reason might be because Mr B walks twice as fast as Mr A. So it would be wrong to put the same amount of herbicide in their tanks.

One shouldn't make arbitrary assumptions about the number of loads and the quantity of herbicides to mix with water during spraying. One must calibrate his knapsack sprayer so that one would know the number of tank loads that would be required to spray a field and the quantity of herbicides to put in each tank load. Doing so, one wouldn't spray too much herbicides, nor would one spray too little.

A Simple way to do this.

Materials required :
1. Measuring tape and pegs.
2. Your Knapsack sprayer
3. Stop watch
4. Measuring cylinder.

NB: calibration is best done in the field one intend to spray. One must calibrate the knapsack sprayer one would be using by oneself.

PROCEDURE:
Step 1. Mark out with pegs an area 10m by 10m (one hundredth an hectare).

Step 2. Fill two-third of your knapsack sprayer with water.

Step 3. Spray the marked out area using a comfortable pace and a moderate pumping pressure.

Step 4. Use a stop watch to record the time it took to spay the plot.

Step 5. Fill the sprayer once again and this time, spray into a measuring cylinder with a moderate pumping pressure the time it took to spray the marked out area. For example, if it took 50 seconds to spray the plot, spray into the measuring cylinder with a moderate pumping pressure for 50 seconds.

Step 6. Measure the volume of water in the cylinder.

CALCULATION

Application rate per hectare of the knapsack sprayer (for the person) = volume of water in the cylinder * 100.

For example if the volume of water measured is 2 liters, the application rate per hectare would be:
2 liters* 100= 200 liters per Ha.


This means the person would need 200 to spray an hectare. If it is a 20 liters capacity sprayer, the person would need 10 loads to spray an hectare.

If the recommended rate of application of the herbicide is 4 liters per hectare, he would have to divide 4 liters (4000 milliliters) by the 10 loads which is equivalent to 400 milliliters per sprayer tank.

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