About KINOSHITA RINTARO
About SILA Daniel
About Jomo Kenyatta Univ. Agriculture and Technol.
About KOAZE HIROSHI
About Jomo Kenyatta Univ. Agriculture and Technol.
About TANI MASAYUKI
About 日本土壌肥料学会講演要旨集(Web)
About Republic of Kenya
About potato
About soil fertility
About surface soil
About soil profile
About chicken dropping
About volcanic ash soil
About phosphorus
About phosphoric acid
About ammonium phosphate
About animal waste
About phosphate fertilizer
About cultivation management
About crop yield
About soil fertility
About manuring practice
About available phosphate
About Tubers(=corms)
About Soil fertility
About Fertilizer application and efficiency
About ケニア
About 高地
About バレイショ
About 地域
About 土壌
About 肥沃度
About 生産性向上
About 可能性