Farm soil study
A DNA survey of the soil beneath five plants in a recovering orchard: the census, the nitrogen pattern under clover, and every caveat. The full study, told across eight pages.
Interannual change
Do soil bacterial communities at distant sites change in step from year to year? 1,212 soil cores across North America say yes, weakly but coherently. Abstract.
pH threshold
The turnover between acid-loving and neutral-soil ammonia oxidizers, fitted as a curve for the first time, and where it says liming stops paying. Abstract.