@article{oai:soar-ir.repo.nii.ac.jp:00010978,
 author = {INOUE,  Naoto and KATO,  Futoshi and SASAKI,  Futoshi and SEKINUMA,  Mikio and KASAJIMA,  Shin-ya and ARASE,  Teruo},
 journal = {信州大学農学部AFC報告},
 month = {Mar},
 note = {Codonopsis lanceolata (Sieb. et Zucc.) Trautv. is a valuable wild vegetable in East Asian countries, especially Korea. We investigated effects of organic fertilizer application on rhizome yield and quality under Andosol soil conditions in the AFC field of Shinshu University. Commercial barnyard manure, which was fermented with crushed bark and beef cattle dung, and Japanese oak leaf mold were applied at the rates of 0, 5, 10, 15, and 20 g m-2. Barnyard manure increased the fresh weight yield of rhizomes but decreased the DL-α-tocopherol (vitamin E) content. The rhizome yield was drastically influenced by the C/N ratio of the soil from the surface to 30 cm below ground level that was controlled by the application ratio of barnyard manure to leaf mold. Total N, soluble P, exchangeable K, Ca, and Mg did not significantly affect the rhizome yield. There was a significant negative correlation between the rhizome fresh weight and vitamin E content at harvest time. The highest vitamin E content of 9-10 mg 100 g-1 dry matter was obtained at a leaf mold application rate of 10 g m-1. Nitrogen supply from the soil to plants primarily influenced the yield and quality of rhizomes as vegetables or drugs. The vitamin E content under a higher soil C/N ratio was the highest among commercial vegetables available in common Japanese food markets., Article, 信州大学農学部AFC報告 10: 1-7(2012)},
 pages = {1--7},
 title = {Influence of organic fertilizer on rhizome yield and α-tocopherol content of Codonopsis lanceolata},
 volume = {10},
 year = {2012}
}