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Weed learning module
Answer ...
Why did weed size respond to the low N compost, but not the high N compost in 2004?
We don't know the answer to this. One possibility is that much of the N and K in the "soluble" compost leached out of the field due to the very wet season. Note that this explanation requires that a greater percentage of the nutrients leached at the higher rates than at the lower rates, since the corn showed a yield response to a moderate rate of the high N "soluble" compost.
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