Module 4:

Materials

4.4 How much is needed?

4.4.10 Plant growth regulators

A plant growth regulator is to be applied at monthly intervals during April to September. This is 6 applications in total for this work plan.

The product is to be applied at a rate of 1 litre of concentrate in 400 litres of water per hectare. It can only be used on no more than 15% of a pitch at any one time.

What is the total quantity of concentrate that is needed for a 7,000m² pitch in this work plan?

1. Do you need some initial help with the calculations?

The pitch area is 7,000m².

This is 0.7 of a hectare.

If the application rate for the concentrate is 1 litre per hecatre, then for the football pitch there is just 0.7 litres required.

Hopefully this helps you do the remainder of the calculation by focusing just on the required values.

2. Do you need some more help with the calculations?

If there is 0.7 litres of concentrate needed for the pitch foer each month's application this just needs to be multipied by the number of months the work programme is running for. The question has stated that it is for 6-months.

Can you now work out the final maximum quantity that is being asked for?

3. Do you need some other help with the final calculation?

So, 0.7 litres for one application x 6 applications = 4.2 litres of concentrate needed for the work programme.

There can be another way to arrive at a correct answer, but hopefully the above approach has been clear

Several products are available, with Attraxor - Plant Growth Regulator (1.5kg) being a common example. It has the chemical prohexadione as its active ingredient and has a typical application rate on football pitches of 0.75-1.5kg per hectare, being dissolved in 300-600 litres of water for either application rate. A 7,000m² pitch would therefore require 0.525-1.05kg of the water-soluble granules per application.

Module progress: 89%

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