长期以来，水稻的栽培一般为平田式，为搁田和生育后期需要，也有一些稻区在田中开挖串心沟或井字沟。以排去过多的水份，起到了增产作用。我国西南一些省份在冷浸田中采用垄作方式种稻，大大地提高了产量。在全国范围内引起重视的稻田养鱼方式，虽增加了田中沟的密度，减少了 For a long time, the cultivation of rice is generally Hirata-style, which is required for the rest of the field and the later period of fertility. There are also some rice fields that excavate the string hearth or sulci in Tanaka. In order to drain too much water, played a role in increasing production. Some provinces in Southwest China use paddy fields to grow rice in cold-dip fields, greatly increasing their output. The paddy field fish farming that has drawn great attention in the whole country has increased the density of Tanaka ditch and reduced