Why should the spread rate be correct?
Incorrect application can contaminate domestic water supplies and cause nitrification of ponds and drains, clogging them with vegetation and algae.
The economy is obviously a biggie in everyone's mind and the effects can be dramatic. Excess fertilizer is often not taken up by the plant and leaches below the root zone and lost, which can cause soil acidification. Too little fertilizer causes less plant growth & reduces the anticipated yield. Both scenarios have negative results, wasted fertiliser &/or a lower yield than expected.
Why won't my spreader spread the correct rate?
Your new fertiliser spreader will come with an owners manual, that should show you the settings to adjust the aperture or flow shutter to achieve the desired rate of fertilizer application. The problem that can cause variation is that fertiliser consistency can vary between countries it's produced in and batches due to the different characteristics in each geographic area. Also often depending on how many times the fertilizer has been handled before it gets to the end user too.
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