黑龙江省龙江县地处大兴安岭与松嫩平原的过渡地带，资源丰富，幅员辽阔。全年有效积温2680℃，无霜期128天。全县土地面积58万多公顷，其中耕地面积23万多公顷，水稻面积1．87万公顷，占耕地面积的8％。推广旱育稀植以来，本县水稻生产迅速发展。1983年水稻种植面积仅1500多公 Longjiang County, Heilongjiang Province is located in Daxinganling Songnen Plain and the transition zone, rich in resources, a vast territory. Annual effective accumulated temperature 2680 ℃, frost-free period 128 days. The county land area of ​​580,000 hectares, of which 230,000 hectares of arable land, paddy area of ​​18,700 hectares, accounting for 8% of arable land. Since the promotion of dry and farming planting, the rapid development of rice production in this county. In 1983, the area under rice cultivation was only over 1,500 km