In Tamil, we call this 'manvasanai', which literally translates to the smell of earth.
As this involves rain and earth, This poem immediately springs in the mind.
The red earth and pouring rain.
Red earth and pouring rain[1] What could my mother be to yours? What kin is my father to yours anyway? And how Did you and I meet ever? But in love our hearts have mingled as red earth and pouring rain
[Translated by AK Ramanujan (Kuruntokai - 40)
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On a side note, poetry isn't poetry without proper spacing.
It's like that tribe in South America somewhere that didn't have words for colors, except in expressions as "colored like the sun" etc.
Presumably this has something to do with the underlying biology. Our colour space is more or less three-dimensional because we have three kinds of receptor in the eye (I'm ignoring the rods here since they aren't involved in colour vision); there are thousands of different kinds of receptor in the nose.
On the other hand, there are many many receptors of each kind in the eye; perhaps shape would be a better analogue for smell. And indeed most of our shape words are for quite specific shapes. There are some broader ones -- smooth, spiky, convoluted, etc. -- but likewise there are a few broader terms for describing smells -- pungent, musky, musty, sweet, etc.