甘薯的“优、大、速、密”繁种法既能解决生产上的病、杂、退化问题,又能快速繁殖推广优良品种,改变靠大量调种生产为就地留种,是提高甘薯单产的一个重要措施。其具体技术要点如下: “优”是指优种株;在甘薯病、杂、退化严重的生产田中选择种性好,生长健壮的一个优良品种单株;或者从已明确要推广的新品种中选择一个优良单株作为原种繁种株。 “大”是指大株育苗:将选出的原种株采用温床早期育出壮苗,然后剪秧头苗培植成大株薯,每株占地面积约为1.5平方米,给以充足的水肥,加强管理,促使薯菌早发、多发,育出短壮菌。 Sweet potato’s “excellent, big, speed, dense” breeding method can not only solve the production of disease, miscellaneous and degeneration problems, but also rapid propagation and promotion of fine varieties, change by a large number of seed production for in-situ seed, is to improve sweet potato An important measure of yield. The specific technical points are as follows: “excellent” refers to the superior strains; sweet potato disease, miscellaneous, serious degenerative production field selection good species, robust growth of a fine variety of single plant; or has been explicitly to promote the new varieties Choose a good single plant as the original variety. “Large” refers to the large plant nursery: The selected original plant breeding nursery seedlings early hotbed, and then cut seedlings grown into large plant seedlings, each plant covers an area of ​​about 1.5 square meters, to give adequate Water and fertilizer, strengthen management, prompting the early onset of potato, multiple, breed short sturgeon.