杂交稻种对提高水稻单产、大幅度增产粮食起到了极其重要的作用。但是,要确保杂交水稻持续增产,必须决心提高稻种的纯度和净度,切实过好这“十关”: 1.过好隔离关。制种田与繁殖田、大田一定要严格隔离:山区丘陵要求有100米以上的隔离区,平原湖区要求有200米以上的隔离区。采用生育期隔离,花期应相差25天以上。采用屏障隔离则应在6天以上。有条 Hybrid rice species play an extremely important role in increasing rice yield and increasing grain yield dramatically. However, to ensure the continuous increase of yield of hybrid rice, we must make every effort to improve the purity and clarity of the rice varieties. System of farming and breeding fields, the field must be strictly isolated: Hill hills require isolation zone of more than 100 meters, plains Lake District requires more than 200 meters of isolation zone. The use of isolated growth period, flowering period should be more than 25 days. Barrier isolation should be more than 6 days. There are articles