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我所选用高代优良早花西瓜自交系为母本,以在F_1代有明显指示性状的高代优良自交系为父本,选育出早熟良种西瓜郑杂5号,1987年7月通过鉴定。一、郑杂5号西瓜选育概况早花西瓜的生产用种混杂退化现象十分严重,为此提出了能保持该品种主要优点,而经济性状有所改进和有利于提高种子质量纯度的育种目标。1982年选配了10个组合,1983年初选出基本符合育种目标的郑条5号西瓜;1984年继续小区评比;1985～1986年参加全国西瓜区域试验,并开展了生产性试种。
I chose the high generation of fine early flowering watermelon inbred lines as the female parent, in F1 generation have obvious indications of elite inbred lines as the male parent, breeding of early maturing watermelon Zhengza 5, July 1987 Through the identification. First, Zhengza 5 watermelon breeding overview Early flowering watermelon production of mixed species degradation is very serious, this proposed to maintain the main advantages of the species, and economic traits have improved and is conducive to improving the quality of seed breeding goals . In 1982, 10 combinations were selected, and in early 1983, Zhengzui No. 5 watermelon which basically met the breeding target was selected. Community evaluation continued in 1984; from 1985 to 1986, it took part in the national watermelon regional trial and carried out productive trials.