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怀山药是薯芋科(Dioscoreaceae)多年生缠绕植物,地下茎供食用和药用。在河南辉县栽培条件下、主蔓6月中旬生长最快,每日生0.4~0.6片叶,9月下旬叶片转黄。5月底为地下茎形成期,6月底为地下茎快速生长期。以后逐渐减慢。主蔓与地下茎生长规律符合Logistic数学方程。现蕾期为6月14~19日,收获期为10月下旬至11月上旬。小区间不同肥料处理对怀山药地下茎产量差异极其显著。
Chinese yam is a perennial twig of Dioscoreaceae, which is used for food and medicinal purposes. Cultivation conditions in Henan Huixian, the main man grow fastest in mid-June, 0.4 to 0.6 per day leaves, leaves turn yellow in late September. By the end of May for the formation of underground stems, by the end of June for the rapid growth of underground stems. Slow down later. The law of growth of main vine and underground stem accords with Logistic mathematical equation. Budding period of June 14 to 19, the harvest period from late October to early November. Differences among sub-area and different fertilizer treatments on the yield of Chinese yam were extremely significant.