About GREENWOOD D J
About National Vegetable Research Station, UK
About NEETESON J J
About Inst. Soil Fertility, The Netherlands
About DRAYCOTT A
About National Vegetable Research Station, UK
About Plant and Soil
About nitrogen fertilizer
About Tubers(=corms)
About 窒素肥料
About ジャガイモ
About 動態モデル