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云单9号是云南省农科院玉米室利用三系杂交育成的玉米新品种。1993年引入我县试制,平均单产235.5kg,最高单产275.5kg。1996年推广种植面积14508亩。其制种技术要点是: 1 选地隔离。制种田块要地势平坦,集中连片,土壤肥沃,排灌方便,地温高。空间隔离四周在300m以上无其它玉米品种。 2 种子处理与播种时间。播种前晒种1～2天,利用高温紫外线杀灭种子表面的病菌,增强种子内酶的活性,提高种子的吸水力和发芽
Cloud alone 9 is the Yunnan Academy of Agricultural Sciences maize three-line hybrid breeding bred new varieties of corn. Introduced in 1993 trial in our county, the average yield 235.5kg, the highest yield 275.5kg. In 1996 to promote the planting area of 14,508 mu. Its seed production technology points are: 1 election to isolation. System of farming plots to flat, concentrated contiguous, fertile soil, irrigation and drainage convenience, high ground temperature. Space isolation around more than 300m no other corn varieties. 2 seed treatment and sowing time. Pre-planting sunburn 1 to 2 days, the use of high temperature UV to kill germs on the seed surface, enhance the activity of seeds within the enzyme to improve seed water absorption and germination