一九九四年廊坊地区春播玉米为什么发生空秆、秃尖、缺粒１９９４年廊坊地区种子公司销售的掖单１３、农大６０等春播玉米杂交种，普遍出现了空秆、秃尖、缺粒现象。为了找出原因，他们对大兴、武清等县的玉米田进行了专题调查，初步确定掖单１３、农大６０等品种发生空秆... In 1992, spring maize sowing in Langfang was empty, bare and missing. In 1994, Yedan 13 and Nongda 60 sold by seed companies in Langfang Prefecture, there were empty corn stalks, phenomenon. In order to find out the reasons, they conducted a special investigation on the cornfields in Daxing and Wuqing counties, and initially determined the occurrence of empty stalks in varieties such as Yeda 13 and Nongda 60 ...