Long-term changes in paddy soil fertility in Peninsular Malaysia during 50 years after the Green Revolution with special reference to their physiographic environments by Tanaka, Sota, Saito, Haruyoshi, Kajiwara, Nao, Tan, Ngai Paing, Mohd Yusoff, Khairul Hafiz, Abe, Susumu S., Nakao, Atsushi, Yanai, Junta

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