8 Steps for How to Make Better Garden Soil
(Page 3 of 8)
June/July 2007
By Harvey Ussery
4.“Mine” soil nutrients with deep rooted plants. As I explained in the previous article, when you first start gardening, it may be necessary to use rock powders, and other slow-release sources of minerals, to correct mineral deficiencies in the soil. In the long run, however, you can supply minerals without purchasing inputs. The organic materials we add to our soil supply most of the minerals healthy crops need. In addition, we plant “fertility patches” to grow a lot of our own mineral supplements.
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These fertility patches include plants that function as “dynamic accumulators.” That is, their roots grow deep, and “mine” mineral reserves from the deeper layers of subsoil, where it has weathered out of the parent rock. The roots of comfrey, for instance, can grow 8 to 10 feet into the subsoil. Stinging nettle is another extremely useful dynamic accumulator. Both nettle and comfrey, in addition to high mineral content, are high in nitrogen. They make excellent additions to a compost heap or can be used as mulches.
If you have some pasture, think of it as a fertility patch par excellence. When growth is fast and lush in the spring, you should be able to take one or two cuttings, perhaps even more, for use in composting or as mulches. If you don’t have a pasture, consider using parts of your lawn instead. I overseed my lawns each fall with the same sort of grass/clover mix I use on the pasture. In the spring, I allow some areas to grow about 8 or 10 inches before cutting it with the scythe and using it for fertility applications elsewhere.
A final thought about fertility patches: Many gardeners are a bit paranoid about “weeds,” but some weeds are deep rooted, and can be used like comfrey as dynamic accumulators to bring minerals up from the deep subsoil. An example is yellow dock (Rumex crispus). Why not allow some yellow dock to grow here and there, in edges and corners where it is not in the way? When the plants start to make seed heads, cut them off just above the crown to prevent huge numbers of seeds from blowing loose in the garden, then use the plants in mulches or composts.
5. Plant cover crops. Growing cover crops is perhaps the most valuable strategy we can adopt to feed our soil, build up its fertility and improve its structure with each passing season. Freshly killed cover crops provide readily available nutrients for our soil microbe friends and hence for food crop plants. Plus, the channels opened up by the decaying roots of cover crops permit oxygen and water to penetrate the soil.
Legumes (clovers, alfalfa, beans and peas) are especially valuable cover crops, because they fix nitrogen from the atmosphere into forms available to crop plants. Mixes of different cover crops are often beneficial. For example, in mixes of grasses and clovers, the grasses add a large amount of biomass and improve soil structure because of the size and complexity of their root systems, and the legumes add nitrogen to help break down the relatively carbon-rich grass roots quickly.
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