最近的梅雨季節，使回田的一條小路長滿菇菌，剛剛回想起 Steiner 在演講的內容，而這也是 Harald 老師在工作坊教授過的
菇菌通常會和有害的寄生蟲和病菌有親密的關係，會一同生長擴散，但當蘑菇不是生長在林木中，而是集中在農場某處潮濕的草地上生長，細菌和寄生蟲反而不會到農場的其他地方生長
所以 Steiner 說農場土地不必全部開墾，因為這會減低生產質素，反而應保留一部分林木、果樹、灌木和長菇菌的草地，才是自然農耕的相互關係
(Demeter 國際認證要求農場面積有一定比例自然的 buffer zone)
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Moreover, when we trace these intimate relationships in Nature, we gain a new insight into the essence of what is harmful. For just as the coniferous forests are intimately related to the birds and the bushes to the mammals, so again all that is mushroom — or fungus-like— has an intimate relation to the lower animal world — to the bacteria and such-like creatures, and notably the harmful parasites. The harmful parasites go together with the mushroom or fungus-nature; indeed they develop wherever the fungus-nature appears scattered and dispersed.
Thus there arise the well-known plant-diseases and harmful growths on a coarser and larger scale. If now we have not only woods but meadows in the neighbourhood of the farm, these meadows will be very useful, inasmuch as they provide good soil for mushrooms and toadstools; and we should see to it that the soil of the meadow is well-planted with such growths. If there is near the farm a meadow rich in mushrooms — it need not even be very large — the mushrooms, being akin to the bacteria and other parasitic creatures, will keep them away from the rest. For the mushrooms and toadstools, more than the other plants, tend to hold together with these creatures. In addition to the methods I have indicated for the destruction of these pests, it is possible on a larger scale to keep the harmful microscopic creatures away from the farm by a proper distribution of meadows.
So we must look for a due distribution of wood and forest, orchard and shrubbery, and meadow-lands with their natural growth of mushrooms. This is the very essence of good farming, and we shall attain far more by such means, even if we reduce to some extent the surface available for tillage.
It is no true economy to exploit the surface of the earth to such an extent as to rid ourselves of all the things I have here mentioned in the hope of increasing our crops. Your large plantations will become worse in quality, and this will more than outweigh the extra amount you gain by increasing your tilled acreage at the cost of these other things. You cannot truly engage in a pursuit so intimately connected with Nature as farming is, unless you have insight into these mutual relationships of Nature’s husbandry.