Jiriki o zōshinsuru hōhō
By: Hokkaidō Nōgyō Shikenjō kōtei ; Hokkaidō Nōgyō Kyōiku Shinkōkai hen
Series: Hokkaidō jitsuyō nōgyō shinsho -- 2
Publisher: Shin Nihon Kyōikusha
Published: 1949
Place of publication: Sapporo-shi
Language: jpn
Number of pages: 156
Subjects: Soil fertility