user: 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%)?
Columns: ['District', 'Total amount of trees', 'Prevailing types, %', 'Amount of old trees', 'Amount of trees, that require replacement']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Kirovsky', 188497.0, 'Pine — 29.37 Poplar — 26.12 Acer negundo — 13.2', '98,374 (52.18%)', '2,322 (2.36%)']
SQL:

assistant: SELECT "District" FROM "Table" WHERE "Total amount of trees" < 150817.6878461314 AND "Amount of old trees" = '1,928 (1.89%)';