human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: District, Total amount of trees, Prevailing types, %, Amount of old trees, Amount of trees, that require replacement
###Question: What is the district when the total amount of trees is smaller than 150817.6878461314 and amount of old trees is 1,928 (1.89%)?
gpt
SELECT District FROM table WHERE Total amount of trees < 150817.6878461314 AND Amount of old trees = 1,928 (1.89%)