三、矮化育种矮化育种实际上也是高产育种的一部分。要高产就得想法使秆矮一些,其目的是为了防倒。但矮秆不一定防例,高秆也不一定倒伏。一般来讲,矮秆重心靠下,比较抗倒伏。但矮秆毛病较多,如不抗病、早衰、粒秕等。我们的体会是:①要坚持矮化育种,不能知难而退。矮化育种首先要考虑矮秆性状,其次再考虑其它性状;②要创造矮秆亲本的材料。刚开始, Third, dwarf breeding dwarf breeding is actually part of high-yielding breeding. To have a high yield to make the stalk shorter, its purpose is to prevent down. But dwarf does not necessarily prevent cases, stalks are not necessarily lodging. In general, the lower dwarf center of gravity, the more lodging. However, more dwarf diseases, such as disease resistance, premature aging, grain 秕 and so on. Our experience is: ① to dwarf breeding, can not be difficult to retreat. Dwarf breeding should first consider dwarf traits, followed by other traits; second, to create dwarf parental material. Just started,