本省珠江三角洲广大的冲积平原地区,是水源便利的河网地带。因地制宜的利用稻田、畦沟、水圳、小河涌、塘基堑、浅水池塘等水面,放养水生绿肥红萍,是一条增辟肥源的有效途经。在晚造稻田普遍缺肥的情况下,养殖夏季红萍,用作晚稻基肥、追肥或壮尾肥,更有其重大的实用意义。 The vast Pearl River Delta alluvial plain in the province, is a convenient water network. According to local conditions, the use of paddy fields, irrigation ditch, water Shenzhen, small rivers, ponds, shallow ponds and other water surface, stocking aquatic green manure, is an effective way to increase the source of fertilizer. In the late rice fields generally lack of fertilizer, the cultivation of summer red duckweed, as late rice basal, top dressing or strong tail fat, more of great practical significance.