crops
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I'm sure this is the wrong crowd to ask, but you never know. Behind the mansion where I rest my being after working hours there are fields. This year there is corn and some sort of wheat I think. It doesn't really matter which type of crop there is grown as long as it has a long stem the same feature arises. The plants in the middle of the field grow larger than those on the side of the field. In fact all stems are large except for those within, let's say, 1 meter of the edges where it gradually grows until a maximum. sample[^] So the question is: why? :)
V.
(MQOTD rules and previous solutions)In addition to the fertilizer answers, humidity is higher in the middle. Farmers know and plan on this, especially in the drier climates of the mountain and desert west.