The heterotic ecotypes were studies by analysing of heterosis of the F1 hybrids, which were created in a diallel set of cross between 9 ecological types.

• 摘要利用9个不同生态类型的50份水稻亲本材料，以生态型为单位进行双列杂交，配制336个组合，研究杂种一代的对照优势和超中亲优势，以杂种优势值作为划分优势生态型的依据。