作物的杂种优势是普遍存在的,但杂种必须具有足够高的产量优势才能在生产中获得应用。自从Immer(1941)首次报道杂种大麦的产量优势为27％以来,国外许多学者在这方面作了大量的研究工作。Hagberg(1953)报道17个杂种大麦的产量优势为O,而Fejer(1976)报道冬性与春性大麦杂交的杂种优势超过100％。但大多数报道认为杂种大麦的产量优势为20—50％。然而,这些数据大多是在稀播单行种植条件下获得的。一般认为这些结果不能很 The crop heterosis is ubiquitous, but hybrids must have a sufficiently high yield advantage to be used in production. Since Immer (1941) first reported a yield advantage of 27% for hybrid barley, many foreign scholars have done a lot of research in this area. Hagberg (1953) reported a yield advantage of 17 hybrids of barley as O, while Fejer (1976) reported a heterosis of more than 100% for the cross between winter and spring barley. However, most reports suggest that the yield advantage of hybrid barley is 20-50%. However, most of these data are obtained under the conditions of thin planting and single row planting. Generally think these results can not be very