About MASAI FUKIKO
About YANAI JUNTA
About TIMBAS Nicola
About フィリピン大
About MEDINA Simplicio
About フィリピン大
About NAKAO JUN
About ABE SUSUMU
About TANAKA SOTA
About 日本土壌肥料学会講演要旨集
About secular variation
About Republic of the Philippines
About paddy soil
About improvement
About soil fertility
About surface soil
About soil acidity
About soil carbon
About soil nitrogen
About particle size distribution
About cation exchange capacity
About calcium
About magnesium
About potassium
About phosphoric acid
About silicic acid
About crop yield
About Oryza sativa
About sodium
About technological innovation
About available silicic acid
About available phosphoric acid
About exchangeable potassium
About exchangeable calcium
About 交換性ナトリウム
About exchangeable-sodium percentage
About exchangeable magnesium
About all carbon
About total nitrogen
About soil pH
About 粒径組成
About green revolution
About Rice cropping
About Soil fertility
About フィリピン
About 水田土壌
About 緑の革命
About 肥沃度