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Margenot, Andrew J.Pulleman, MirjamSommer, RolfPaul, Birthe K.Parikh, Sanjai J.Jackson, Louise E.Fonte, Steven J.[Biochemical proxies indicate differences in soil C cycling induced by long-term tillage and residue management in a tropical agroecosystem]Biochemical proxies indicate differences in soil C cycling induced by long-term tillage and residue management in a tropical agroecosystem
Sommer, RolfBraslow, Juliet[African eco-efficient solutions to food insecurity and climate change]African eco-efficient solutions to food insecurity and climate change

The yield gap has arisen again as a focus for agricultural research to ensure food security and economic growth for farmers around the world. To examine this renewed interest, we carried out a review of key literature in the field of yield gap analysis to identify important gaps in research and a...


Snyder, Katherine A.Miththapala, SriyanieSommer, RolfBraslow, Juliet[The yield gap: closing the gap by widening the approach]The yield gap: closing the gap by widening the approach
Sommer, RolfBossio, Deborah A.[Response to the discussion letter of Lassaletta and Aguilera “soil carbon sequestration is a climate stabilization wedge: Comments on Sommer and Bossio (2014)”]Response to the discussion letter of Lassaletta and Aguilera “soil carbon sequestration is a climate stabilization wedge: Comments on Sommer and Bossio (2014)”
Sommer, RolfPiggin, ColinFeindel, DavidAnsar, MuhammadDelden, Lona vanShimonaka, KayokoAbdalla, JihadDouba, OsamaEstefan, GeorgeHaddad, AtefHaj-Abdo, RousheenHajdibo, AliHayek, PierreKhalil, YaseenKhoder, AhmedRyan, John[Effects of zero tillage and residue retention on soil quality in the mediterranean region of Northern Syria]Effects of zero tillage and residue retention on soil quality in the mediterranean region of Northern Syria
Margenot, Andrew J.Paul, Birthe K.Sommer, RolfPulleman, MirjamParikh, SanjaiFonte, Steven J.[Can conservation agriculture improve phosphorus (P) availability in weathered soils? Effects of tillage and residue management on soil P status after 9 years in a Kenyan Oxisol]Can conservation agriculture improve phosphorus (P) availability in weathered soils? Effects of tillage and residue management on soil P status after 9 years in a Kenyan Oxisol
Yigezu, Yigezu A.Aw-Hassan, Aden A.Shideed, KamilSommer, RolfEl-Shater, Tamer[A policy option for valuing irrigation water in the dry areas]A policy option for valuing irrigation water in the dry areas

Soil organic carbon (SOC) sequestration is important in the global carbon cycle and an integral part of many initiatives and policies to mitigate climate change. For efficient targeting of measures leading to SOC sequestration, it is necessary to know the actual SOC content (%) and a realistic ta...


Piikki, KristinSöderström, MatsSommer, RolfSilva, Mayesse daMunialo, SussyAbera, Wuletawu[A Boundary Plane Approach to Map Hotspots for Achievable Soil Carbon Sequestration and Soil Fertility Improvement]A Boundary Plane Approach to Map Hotspots for Achievable Soil Carbon Sequestration and Soil Fertility Improvement
Sommer, RolfThierfelder, ChristianTittonell, Pablo A.Hove, L.Mureithi, JMkomwa, S[Fertilizer use should not be a fourth principle to define conservation agriculture: Response to the opinion paper of Vanlauwe et al. (2014) ‘A fourth principle is required to define conservation agriculture in sub-Saharan Africa: The appropriate use of fertilizer to enhance crop productivity’]Fertilizer use should not be a fourth principle to define conservation agriculture: Response to the opinion paper of Vanlauwe et al. (2014) ‘A fourth principle is required to define conservation agriculture in sub-Saharan Africa: The appropriate use of fertilizer to enhance crop productivity’

Secondary and micronutrients are important in enhancing crop productivity; yet, they are hardly studied in sub-Sahara Africa. In this region, the main focus has been on macronutrients but there is emerging though scattered evidence of crop productivity limitations by the secondary and micronutrie...


Kihara, JobSileshi, Gudeta W.Nziguheba, GeneroseKinyua, MichaelZingore, ShamieSommer, Rolf[Application of secondary nutrients and micronutrients increases crop yields in sub-Saharan Africa]Application of secondary nutrients and micronutrients increases crop yields in sub-Saharan Africa

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