玉米自交系黄早4改良系3个主要性状的鉴定和筛选

１９９１～１９９２年对１０个不同来源的玉米自交系黄早４改良系进行了系统的抗病性鉴定和配合力。自身产量测定及农艺性状观察、从试验结果看出：Ｈ４５２５，７１８，冀３５等黄改系在抗病性上有所增强；黄４０５２，双１０５，黄４２８等黄改系一般配合力超过黄早４；冀３５，双１０５，农大２５６等自身产量较高，比黄早４增产３０．１～６４．６％；在抗病性、配合力、自身产量３个主要性状上均优于黄早４的有黄４０５２，冀３５，双１０５，农大２５６等４个，７１８与Ｍ０１７，Ｈ２１与掖１０７特殊配合力较高，因此可用７１８与Ｈ２１代替黄早４进行烟单１４和掖单２号玉米杂交种的大田制种。

Identification and Screen for Three Main Characters of Improved Huangzao 4 Corn Inbred lines

The disease resistance crossability and yield as well as other characters of ten improved inbred lines of Huangzao 4 from various sources were tested systematically in 1991 and 1992. The results showed that the disease resistance of some improved inbred lines was improved to some degree; the general crossability of some improved lines was higher than Huangzao 4 and some of them were more productive than Huangzao 4, the yield increased for 5. 0￣63. 0%. There were four lines better than Huangzao 4 in the three main characters of disease resistance crossability and its own productivity simulta neouslt.They were Huang 4052 Ji 35 Shuang105 and Nongda 256 The specific crossability of 718×M107 and H21× Ye107 were much higher than 718 and H21 and could be used for taking the place of Huangzao 4 in seed production of Yandan 14 and Yedan 2.