Origin: as. Fealu, fealo, pale yellow or red; akin to D. Vaal fallow, faded, OHG. Falo, g. Falb, fahl, Icel. Folr, and prob. To lith. Palvas, OSlav. Plav white, L. Pallidus pale, pallere to be pale, gr. Gray, Skr. Palita. Cf. Pale, Favel, favor.
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... in soil and have effect on the plant... :) yes, and some of those plants such as legumes produce nitrate rich soil. Farmers allow fields to go fallow and plant it with nitrate rich plants and then turn it over the following season/s and plant crops or use as graze. If you see a lot of clover ...
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