So you agree humus is good stuff. But will your soil contain all the nutrients necessary for healthy plant growth if all you add to it is humus? You already know incorporating organic matter that becomes humus means you will probably have to add nitrogen. Plants also need many other nutrients.
With the exception of carbon, which plants take from carbon dioxide in the air, as well as hydrogen and oxygen, which they derive from water, all other elements plants use must come directly from the soil. So what do they need?
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