Importance of phosphorus and potassium in soil-specific nutrient management for wet-season rice in Cambodia

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dc.creatorKong, Kea
dc.creatorHin, Sarith
dc.creatorSeng, Vang
dc.creatorIsmail, Abdelbagi M.
dc.creatorVergara, Georgina
dc.creatorChoi, Il-Ryong
dc.creatorEhara, Hiroshi
dc.creatorKato, Yoichiro
dc.date2020-04
dc.date2024-12-19T12:54:08Z
dc.date2024-12-19T12:54:08Z
dc.date.accessioned2026-06-27T04:12:46Z
dc.descriptionRice is widely grown in rainfed lowlands during the wet season in the Mekong region. Limited nutrient availability is a common constraint on crop yield, and the optimal rate of fertilizer application depends on the soil type. The objective of our study was to evaluate rice productivity and the economic feasibility of various nutrient management regimes in Cambodia. We conducted field experiments on three soil types (Prey Khmer, Prateah Lang, and Toul Samroung, equivalent to Psamments, Plinthustalfs, and Endoaqualfs, respectively) in four provinces (Battambang, Kampong Thom, Pursat, and Siem Reap) during the 2016 and 2017 wet seasons to compare nine (2016) and seven (2017) N–P–K combinations. Grain yield ranged from 0.9 to 4.8 t ha−1 in 2016 and from 1.0 to 5.2 t ha−1 in 2017, depending on soil type and nutrient management. The Prey Khmer soil contained around 80% sand, and rice yield responded most weakly to nutrient management. The moderate fertilizer input in the current soil-specific recommendation was effective on this soil type. However, on more fertile soils with a higher clay content and a higher cation-exchange capacity (Toul Samroung and Prateah Lang), an additional 20 kg N ha−1 combined with adding 15 kg ha−1 of P2O5 or 20 kg ha−1 of K2O significantly increased yield and economic return. Although P and K use during Cambodia’s wet season is uncommon, our results demonstrate the importance of these nutrients in improving the country’s rice production.
dc.identifierhttps://hdl.handle.net/10568/164639
dc.identifier.urihttp://hdl.handle.net/123456789/25281
dc.languageen
dc.publisherCambridge University Press
dc.sourceKong, Kea; Hin, Sarith; Seng, Vang; Ismail, Abdelbagi M.; Vergara, Georgina; Choi, Il-Ryong; Ehara, Hiroshi and Kato, Yoichiro. 2020. Importance of phosphorus and potassium in soil-specific nutrient management for wet-season rice in Cambodia. Ex. Agric., Volume 56 no. 2 p. 204-217
dc.subjectagronomy
dc.subjectcrop science
dc.titleImportance of phosphorus and potassium in soil-specific nutrient management for wet-season rice in Cambodia
dc.typeJournal Article

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