Effect of organic amendments on the productivity of rainfed lowland rice in the Kilombero floodplain of Tanzania

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dc.creatorKwesiga, J.
dc.creatorGrotelüschen, Kristina
dc.creatorSenthilkumar, Kalimuthu
dc.creatorNeuhoff, D.
dc.creatorDöring, T.F.
dc.creatorBecker, M.
dc.date2020-08-29
dc.date2021-01-12T13:43:00Z
dc.date2021-01-12T13:43:00Z
dc.date.accessioned2026-06-27T13:18:13Z
dc.descriptionOrganic amendments can reportedly sustain and increase lowland rice productivity in smallholder systems. Few studies have assessed locally-available substrates in hydrologically variable floodplain environments. We investigated the effects of green and farmyard manures on rice yields, and total soil C and N in the Kilombero floodplain, Tanzania. At both the fringe and the middle positions, five treatments were applied in 2016 and 2017, comprising (1) non-amended control, (2) farmyard manure, (3) pre-rice legumes, (4) post-rice legumes and (5) a combination of green and farmyard manures. Residual treatment effects were assessed in 2018 when rice plots were uniformly non-amended. Depending on the year and the position, organic amendments increased rice grain yields by 0.7–3.1 Mg ha–1 above the non-amended control. Sole green and farmyard manure applications had similar effects on grain yield, while a combination of green and farmyard manure led to a significant increase in grain yield above both the control and sole applications of organic amendments in both years. The contribution from biological N2 fixation by legumes ranged from 4 to 61 kg N ha–1. Despite partial N balances being mostly negative, we observed positive residual effects on the yield of the non-amended rice in the third year. Such effects reached up to 4 Mg ha−1 and were largest with post-rice legumes, sole or combined with farmyard manure. Irrespective of the position in the floodplain, manures significantly increased soil C and N contents after two years, hence enhancing soil fertility and resulting in increased rice grain yields. Comparable benefits may be obtained along the hydrological gradients of other large river floodplains of the region and beyond.
dc.identifierhttps://hdl.handle.net/10568/110828
dc.identifier.urihttp://hdl.handle.net/123456789/55911
dc.languageen
dc.publisherMDPI
dc.rightsOpen Access
dc.sourceKwesiga, J., Grotelüschen, K., Senthilkumar, K., Neuhoff, D., Döring, T.F., Becker, M. Effect of Organic Amendments on the Productivity of Rainfed Lowland Rice in the Kilombero Floodplain of Tanzania . Agronomy 2020, 10,9,1280.
dc.subjectrainfed farming
dc.subjectrice
dc.subjectresearch
dc.titleEffect of organic amendments on the productivity of rainfed lowland rice in the Kilombero floodplain of Tanzania
dc.typeJournal Article

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