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农作物具有三大强优势,即强遗传部位优势,强异地优势和强杂交优势。了解这三种优势,对品种提纯复壮、防止种性退化,保证农作物超级良种持续优良高产有着重大意义。现介绍如下。一、水稻是顶端优势作物,主穗上部是强遗传优势。选用主穗上部籽粒饱满整齐、谷壳黄亮、新鲜一致千粒重高、生活力强的种子,比用分枝穗种子增产28.85～34.12%。二、玉米是中部优势作物。果穗中部是强遗传优势部位,选用果穗中部籽粒饱满整齐,颜色新鲜一致、生活力强的种子,比果穗的顶部和下部种子增产34.48～
Crops have three major advantages, that is, strong genetic advantage, strong heterosis and heterosis. Understanding of these three advantages, purification and rejuvenation of species to prevent species degradation, to ensure that superb varieties of fine continuous high yield of great significance. Now introduced as follows. First, rice is the top crop, the upper part of the main spike is a strong genetic advantage. Select the main spike full of the upper part of the grain neat, chaff Huang Liang, fresh consistent 1000-grain weight, strong viability of the seed, than the use of branched spike seed yield 28.85 ~ 34.12%. Second, corn is the central advantage of crops. Middle ear is a strong genetic advantage of the site, the middle ear selection full and neat grains, fresh and consistent color, strong vitality of the seeds, ear than the top and bottom of the ear yield 34.48 ~