杂种优势是生物界的普遍规律,国内外关于棉花杂种优势现象早有报导。近年,棉花杂种优势在各地生产上开始应用,并对棉花增产起着积极作用。我院在一九五五年对陆海杂种一代进行了观察,表现了在生长势、结铃性、纤维长度等方面有很强杂种优势,但铃重介于两亲本间,所以产量低于陆地棉,生产上难以利用。第二代继续种植, Heterosis is a universal law in the biological world, and there are reports about the heterosis of cotton at home and abroad. In recent years, the heterosis of cotton has started to be applied in various places and has played a positive role in increasing cotton output. In 1955, our institute observed the cross between sea and land hybrids and showed a strong heterosis in growth potential, boll endurance and fiber length, but the boll weight was between parents, so the yield was lower than Upland cotton, difficult to use in production. The second generation continue to grow,