山药为无性繁殖,生产上常采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,亩产持续突破3500公斤,产值逾5000元。成效显著。 Yam is asexual reproduction, often used in the production of Chinese yam or tuber cutting propagation method, which requires large quantities, high cost, and successive years of easy degradation, combined with the natural elimination of seed tubers, year after year, the seedling more seed Less, the more yield the more low (now a large area of ​​about 2,000 kg per mu). In recent years, the agricultural sector in Sheyang County, Jiangsu Province, has continuously breached 3,500 kilograms of mu and its output has exceeded 5,000 yuan by optimizing seed selection and careful breeding. Significant effect.