Upland rice response to phosphorus fertilization in Asia

Vista sencilla de ítem
dc.creatorGeorge, Thomas
dc.creatorMagbanua, Roger
dc.creatorRoder, Walter
dc.creatorVan Keer, Koen
dc.creatorTrébuil, Guy
dc.creatorReoma, Veronica
dc.date2001-11
dc.date2024-12-19T12:56:55Z
dc.date2024-12-19T12:56:55Z
dc.date.accessioned2026-06-27T04:16:06Z
dc.descriptionUpland rice (Oryza sativa L.) yields on infertile, acid soils in the Asian uplands average only 1 Mg ha−1 Phosphorus deficiency is considered a major soil constraint to increased yield, but little quantitative information is available. We analyzed P responses of traditional rice on farm in Laos, Thailand, and the Philippines and improved varieties in researcher‐managed trials in the Philippines. Treatments in on‐farm trials were a control and 50 kg P ha−1 ± 100 and 50 kg ha−1 N and K, respectively. Treatments in researcher‐managed trials were P rates on an unlimed and limed Ultisol. Mehlich‐1 extractable P correlated with on‐farm grain yield (r = 0.47). Phosphorus fertilization increased average grain yield (1 Mg ha−1) by 20%, total biomass (4 Mg ha−1) by 27%, and P uptake (4.1 kg ha−1) by 53%. Yield increased 37% with P + N + K, but only 16% of the 2.4 Mg ha−1 biomass increase was grain. Improved rice in researcher‐managed trials responded to P, with a larger proportion of biomass partitioned to grain [i.e., higher harvest index (HI)]. Grain yield of ‘UPLRi‐5’ increased from 3.2 to 4.6 Mg ha−1 in limed soil while that of ‘IR55423–01’ increased from 3.4 to 4.0 Mg ha−1 in unlimed soil. Phosphorus fertilization always increased the frequency of higher yields averaged across trials, soils, varieties, and growing conditions. Yield gain from on‐farm P fertilization of traditional rice was small because of low HI, unlike in improved varieties, which had a HI. We infer that increasing upland rice yield in Asia would require genotypes with higher HI in addition to P fertilization.
dc.identifierhttps://hdl.handle.net/10568/167019
dc.identifier.urihttp://hdl.handle.net/123456789/27141
dc.languageen
dc.publisherWiley
dc.sourceGeorge, Thomas; Magbanua, Roger; Roder, Walter; Van Keer, Koen; Trébuil, Guy and Reoma, Veronica. 2001. Upland rice response to phosphorus fertilization in Asia. Agronomy Journal, Volume 93 no. 6 p. 1362-1370
dc.subjectphosphorus fertilizers
dc.subjectsoil fertility
dc.subjectyields
dc.subjectupland rice
dc.titleUpland rice response to phosphorus fertilization in Asia
dc.typeJournal Article

Archivos

Colecciones

Instituto Internacional de Investigación del Arroz (IRRI)