协优3550系广东省农科院水稻所用协青早A与3550组配育成的晚籼中熟新组合,3550是从青四矮16与IR54杂交,经多代选育而成,与江西矮败质源不育系协青早A组配定型后,“经过三个年次的品比试验、区域试验、栽培试验和生产示范,表现高产稳产,受到普遍欢迎,1990年种植面积约12万亩。 Xieyou 3550 is a new medium-late maturing combination of late indica cultivars A and 3550 used by the Institute of Agronomy of Guangdong Academy of Agricultural Sciences. 3550 is a cross between Qinglongsi16 and IR54 and has been bred for many generations. After the progeny of the sterile germplasm Xieqingzao group A was set up, "after three years of product ratio test, regional test, cultivation test and production demonstration, it shows high and stable yield and is widely welcomed. In 1990, the planting area was about 120,000 mu.