Answer: There are a lot of variables that affect rate of decomposition, but I believe your sawdust can still draw nitrogen from the soil after a winter on the garden. Rather than lawn fertilizer, which is water-soluble and will likely leach into the soil rather than remain near the surface with the sawdust, apply a slow-acting nitrogen source, such as alfalfa meal or corn gluten (which also inhibits weed seed germination!).<br><br>The corn stalks, on the other hand, sound like they will rot more quickly. They won't provide much in the way of nutrients for crops, but can contribute to soil organic matter, which is just as important, since organic matter is key to keeping nutrients available to plant roots. Hope this helps!
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