Sentence:  [T]he very wet winter will have washed much of the goodness out of the soil. Homemade compost and the load of manure we get from a friendly farmer may not be enough to compensate for what has <WSD>leached</WSD> from the ground. 
Meaning of the word marked with <WSD> tags:  To purge a soluble matter out of something by the action of a percolating fluid.