02608naa a2200289 a 450000100080000000500110000800800410001902400280006010000150008824501310010326000090023450001720024352015900041565300100200565300220201565300150203765300450205265300240209765300190212165300120214070000130215270000140216570000150217970000160219470000210221077300870223110627382022-09-01       2022    bl uuuu     u00u1 u    #d7 a10.1002/agj2.209642DOI1 aMACEDO, I.  aIrrigated rice rotations affect yield and soil organic carbon sequestration in temperate South America.h[electronic resource]  c2022  aArticle history: Received: 25 July 2021 // Accepted: 16 November 2021 // First published: 25 November 2021. Correspondence: Ignacio Macedo, email:macedoyapor@gmail.com  aRice (Oryza sativa L.) systems rotated with perennial pastures have intensified in South America to increase annual grain productivity, but the effects on rice yield and soil quality remain poorly understood. We evaluated rice grain yield, crop and pasture biomass production, and soil organic carbon (SOC) and total nitrogen stocks (0?15-cm depth) in three rice-based rotations over 8 yr in Uruguay. Treatments were: (a) rice?pasture [a 5 yr rotation of rice?ryegrass (Lolium multiflorum Lam.)?rice, then 3.5 yr of a perennial mixture of tall fescue (Festuca arundinacea Schreb.), white clover (Trifolium repens L.), and birdsfoot trefoil (Lotus corniculatus L.)], (b) rice?soybean [a 2-yr rotation of rice?ryegrass?soybean (Glycine max [L.] Merr.)?Egyptian clover (Trifolium alexandrinum L.)], and (c) rice?cover crop (an annual rotation of rice?Egyptian clover). Rice after soybean or pasture achieved the highest yield (9.8 Mg ha?1), 9% higher than rice after rice in the rice?pasture and rice?cover crop systems. Estimated belowground biomass under rice?pasture (2.7 Mg ha?1) was 12 and 42% greater than under rice?cover crop and rice?soybean rotations, respectively. Rice?pasture showed an increase of 0.6 Mg ha?1 yr?1 of SOC; no changes were observed in the intensified rotations replacing pasture with additional rice or soybean. All systems sustained soil total N. These results provide insights for implementing sustainable rice-based rotations, with rice?pasture being the only system that increased SOC while achieving high rice yields and belowground biomass productivity.  aARROZ  aBulk density (BD)  aROTACIONES  aROTACIONES ARROZ-PASTURAS-OTROS CULTIVOS  aSOIL ORGANIC CARBON  aTOTAL NITROGEN  aURUGUAY1 aROEL, A.1 aAYALA, W.1 aPRAVIA, V.1 aTERRA, J.A.1 aPITTELKOW, C. M.  tAgronomy Journal, 2022, 1-15. OPEN ACCESS. doi: https://doi.org/10.1002/agj2.20964