山药种苗的优化选繁山药为无性繁殖，生产上常用老山药苗或块茎切割繁殖法，其需种量大、成本高，且连年种植易退化，加之种薯的自然淘汰，年复一年，种苗愈种愈少，产量愈种愈低（现大面积亩产２０００公斤左右）。近年来，江苏省射阳县农业部门通过优化选种，精心繁育，... The optimal selection of yam seedlings for propagation of traditional Chinese yam is asexual propagation, commonly used in the production of dried yam seedlings or tuber cutting propagation method, the need for large quantities, high cost, and successive years of planting easy to degenerate, coupled with the natural elimination of seed tubers, year after year , The more seed less seed, the more yield the more low (now a large area of ​​about 2000 kg per mu). In recent years, Sheyang County, Jiangsu Province, the agricultural sector through the optimization of seed selection, well-breeding, ...