P .3 Mapping the system Context The primary analyses we did regarding the “context mapping” of the system involved analyzing known companion plant relationships as well as constructing material flow balances. Companion plant information is not always entirely reliable, since much of the available data is somewhat anecdotal. However, several agricultural extension services and Universities have also published lists of companion plant groups, which can be considered more reliable. In the limited research studies available on companion planting, there have been some impressive findings on the successful impact of such interactions. One source cited a yield increase as high as four-fold as the result of interplanting a Brassica crop with Elm oyster mushrooms. Companion Planting Network The network diagram on the right shows the available companion planting data on our final crop selection. This map was used in constructing the final crop groupings and layouts. The diagram shows the relationship between individual plants, reduced to positive or negative values. A positive value means the plants thrive well in each other’s vicinity, performing better than when alone or in a group of similar plants. A negative relationship means that the plants are detrimental to each other when grown in close proximity. 78 Pagina 77
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