Wood Products Wood products can tie up nitrogen in the soil and cause nitrogen deficiency in plants. Microorganisms in the soil use nitrogen to break down the wood. Within a few months, the nitrogen is released and again becomes available to plants. This hazard is greatest with sawdust, because it has a greater surface area than wood chips. If you plan to apply wood chips or sawdust, you may need to apply nitrogen fe If you plan to apply wood chips or sawdust, you may need to apply nitrogen fertilizer at the same time to avoid nitrogen deficiency.
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............................. I use wood chips that are about 5 years old that I walk on to break down. My garden paths are wood chip paths. Mixed with bird feeder refuse and it is black and fluffy and smells alive. Manured the place many times 30 years ago and the earth worms are rampant. BUT the moles/voles/field mice are too. Just got a volunteer mouser that looks like our deceased midnight but he is afraid of us. I don't blame it in away as I'd have it fixed in a year.