数世纪以来,孟加拉国的土地一直种植水稻,大多数每年都要种2～3季。然而最近,在一些地区出现了新的种植形式,即在冬季用一些旱田作物如小麦、绿豆和油料作物做水稻的下茬。但这些作物往往因为严重缺水而生长不良,产量不高,因此不得不依靠补充灌溉以保 For centuries, land in Bangladesh has been planted with rice, most of which grow for two to three seasons a year. Recently, however, new forms of cultivation emerged in some areas, including the use of some dryland crops such as wheat, mung beans and oilseeds to make the next crop of rice in winter. However, these crops often grow poorly due to severe water shortages and their yields are not high, so they have to rely on supplementary irrigation