Faculty;
of;
Agriculture,;
Ninki;
University,;
Nara;
631-8505,;
Japan;
Department;
of;
Agricultural;
Extension;
and;
Rural;
Development,;
University;
of;
Ibadan,;
Nigeria;
Soil;
Research;
Institute;
(SRI),;
Academy;
Post;
Office,;
Private;
Mail;
Bag,;
Kwadaso,;
Kumasi;