About HIRAI HIDEAKI
About HIRAI MASAYO
About 宇都宮大 雑草と里山の科学教育研究セ
About 日本土壌肥料学雑誌
About student
About soil
About crop(agriculture)
About cultivation
About interest(concern)
About knowledge
About education
About learning
About teacher
About questionnaire
About Soil science in general
About 児童
About 生徒
About 学生
About 土
About アンケート調査
About 解析
About 宇都宮