About KITAGAWA IWAO
About 農業・生物系特定産業技術研究機構
About 土壌の物理性
About upland field soil
About improvement
About work and operation
About production
About field(agriculture)
About weather condition
About crop(agriculture)
About agricultural disaster
About snow cover
About cold region
About technological forecasting
About soil water
About drainage(water)
About technical trend
About wet injury
About agricultural production
About agricultural operation
About drainage improvement
About upland crop
About Soil physics
About Agricultural engineering
About 畑土壌
About 排水改良
About 動向