Effects of Seedling Sizes on the Growth Index and Yield of Hedysarum polybotrys Hand.-Mazz
By selecting the optimal seedling specifications suitable for Gansu's Hedysarum polybotrys planting areas,this study was set to ensure the selection of high-quality varieties,improve the safety and efficacy of medicinal materials,and provide a scientific reference for efficient cultivation of Hedysarum polybotrys in Gansu.4 different seedling sizes of Hedysarum polybotrys were used as materials to study the effect of seedling size on growth indexes and yield.The results showed that key growth indexes,such as above-ground and below-ground mass,were optimal for large seedlings of Hedysarum polybotrys.The fresh root weight per plant was 25.34 g/plant,with a fresh yield of 9 255.6 kg/ha.The incidence of powdery mildew on leaves was lowest at 30%,and root rot incidence was lower at 40% .It indicates that in the cultivation of Hedysarum polybotrys,large seedlings with a primary root length of 35.0 to 40.0 cm,an average root crown diameter of 8.0 mm,and a fresh root weight per plant≥3.6 g/plant should be preferred to promote growth and yield,reduce disease incidence,and enhance drought resistance.
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