HomeInternational Rice Research Notesvol. 30 no. 2 (2005)

Arbuscular mycorrhizal fungi associated with upland rice in a rotational shifting cultivation system

S. Rama Youpensuk | N. Yimyam | B. Rerkasem | B. Dell

Discipline: Agriculture



A rich diversity of arbuscular mycorrhizal (AM) fungi has been found associated with pada (Macaranga denticulata Muell. Arg.), a pioneer tree species used for fallow enrichment in rotational shifting cultivation in the mountainous region of mainland Southeast Asia (Rerkasem et al 2002, Yimyam et al 2003, Youpensuk et al 2004). Association with AM fungi greatly enhanced nutrient uptake in pada growing in an acidic (pH 4.9) and infertile (4 ppm P by Bray II) soil. When N was not limiting, pada plants with AM fungi were found to take up five to six times as much N, P, and K as those without the symbiosis. This paper reports on the diversity of the AM fungi associated with the roots of upland rice growing in a rotational shifting cultivation system at Tee Cha village, Mae Hong Son, northern Thailand (19° 78' N, 93° 84' E, altitude 800 m)