Two Letters Re: Grow Your Own Nutrient Dense Fruits and Vegetables
James, You are correct about the risks of only using a wood mulch in gardening. In his book Gardening When It Counts, Steve Solomon discusses the normal carbon/nitrogen ratio in soil — 12:1 — and compares that to various fertilizers. Woody products such as tree bark can have C/N ratios in excess of 100:1, causing "nitrogen robbing": the nitrogen already in the soil is retained by soil microbes until the wood decomposes and the excess carbon is burnt off, leaving even less nitrogen for the plants in the meantime. As you mention, it can take years for wood to decompose, leaving the …