to bank up with earth / to cultivate (lit. or fig.) / to train (people)
培
=
咅
+
土
:
Pinocchio (p) has been cultivating (培) a big compost heap in the Eiffel Tower's kitchen (ei2). He uses his own poo-poo (咅), which is just humus, and earthed it up in a compartment made of earth (土).