开水泵的人说，这个水泵抽上来的水足够灌溉五千亩地。

The man operating this pump explained that it could supply enough water to irrigate 5000 mu of land.

尽管没有国家统计的数据，仍然可以推断农场规模有的很小，有的达到五千亩。

Although no national statistics on farm size were available, farms can range from very small to up to 5, 000 acres.