Wortmann, C. S. Person

selected publications

• article

  • Nitrogen response functions targeted to technology extrapolation domains in Ethiopia using ceres‐maize.  Agronomy Journal.  113:436-450. 2021
  • Improvement of smallholder farming systems in Africa.  Agronomy Journal.  2020
  • Lowland rice yield and profit response to fertilizer application in Rwanda.  Agronomy Journal.  112:1423-1432. 2020
  • Diagnosis of crop secondary and micro-nutrient deficiencies in sub-Saharan Africa.  Nutrient Cycling in Agroecosystems.  113:127-140. 2019
  • Crop model and weather data generation evaluation for conservation agriculture in Ethiopia.  Field Crops Research.  228:122-134. 2018
  • Conservation Agriculture Effects on Crop Productivity and Soil Properties in Ethiopia.  Agronomy Journal.  110:758-767. 2018
  • Wheat nutrient response functions for the East Africa highlands.  Nutrient Cycling in Agroecosystems.  111:21-32. 2018
  • Conservation Agriculture for Maize and Bean Production in the Central Rift Valley of Ethiopia.  Agronomy Journal.  109:2988-2997. 2017
  • Maize–common bean intercropping to optimize maize-based crop production.  JOURNAL OF AGRICULTURAL SCIENCE.  155:1124-1136. 2017
  • Dry Soil Planting of Maize for Variable Onset of Rainfall in Ethiopia.  Agronomy Journal.  107:1618-1625. 2015
  • Dry Soil Planting of Sorghum for Vertisols of Ethiopia.  Agronomy Journal.  106:469-474. 2014
  • Erratum to: Effectiveness of Grass Filters in Reducing Phosphorus and Sediment Runoff.  Water Air and Soil Pollution.  224:1661. 2013
  • Effectiveness of Grass Filters in Reducing Phosphorus and Sediment Runoff.  Water Air and Soil Pollution.  223:5865-5875. 2012
  • Nitrogen Response and Economics for Irrigated Corn in Nebraska.  Agronomy Journal.  103:67-75. 2011
  • Nitrogen Use Efficiency of Irrigated Corn for Three Cropping Systems in Nebraska.  Agronomy Journal.  103:76-84. 2011
  • High‐Yielding Corn Response to Applied Phosphorus, Potassium, and Sulfur in Nebraska.  Agronomy Journal.  101:546-555. 2009
  • Plant materials for soil fertility management in subhumid tropical areas.  Agronomy Journal.  93:929-935. 2001
  • Nutrient dynamics in a climbing bean and sorghum crop rotation in the Central Africa Highlands.  Nutrient Cycling in Agroecosystems.  61:267-272. 2001
  • Green manures for maize—bean systems in eastern Uganda: Agronomic performance and farmers' perceptions.  Agroforestry Systems.  47:123-138. 1999
  • Crotalaria (C-ochroleuca G Don) as a green manure in maize-bean cropping systems in Uganda.  Field Crops Research.  61:97-107. 1999
  • An agroecological zonation for Uganda: methodology and spatial information 1999
  • Common bean as a cash earner in Sub-Saharan Africa 1999
  • Nutrient balances and expected effects of alternative practices in farming systems of Uganda.  AGRICULTURE ECOSYSTEMS & ENVIRONMENT.  71:115-129. 1998
  • Accomplishments of participatory research for systems improvement in Iganga District, Uganda 1993 to 1997 1998
  • Atlas of common bean (Phaseolus vulgaris L.) production in Africa 1998
  • Phosphorus tolerance in common bean as affected by root architecture 1998
  • Seed yield and stability of bean multiline.  Field Crops Research.  46:153-159. 1996
  • Ravageurs, maladies et carences nutritives du haricot commun en Afrique: guide pratique 1996
  • Bean improvement for low fertility in Africa (BILFA): I. Low soil nitrogen availability 1995
  • Foliar Nutrient Analyses in Bananas Grown in the Highlands of East Africa.  Journal of Agronomy and Crop Science.  172:223-226. 1994
  • African bean production environments: their definition, characteristics and constraints 1994
  • Bean improvement for low fertility soils in Africa : Proceedings of a working group meeting, Kampala, uganda 23-26 May, 1994 1994
  • Nutrient flows from harvested banana pseudostems 1994
  • CONTRIBUTION OF BEAN MORPHOLOGICAL-CHARACTERISTICS TO WEED SUPPRESSION.  Agronomy Journal.  85:840-843. 1993
  • Effects of management practices on bean plant yield components in Uganda 1993
  • Foliar nutrient testing with the diagnosis and recommendation integrated system (DRIS) for beans 1993
  • The banana-bean intercropping system — bean genotype × cropping system interactions.  Field Crops Research.  31:19-25. 1993
  • The diagnosis and recommendation integrated system for dry bean: Determination and validation of norms.  International plant nutrition colloquium. 10.  15:2369-2379. 1992
  • Banana and Bean Intercropping: Factors Affecting Bean Yield and Land Use Efficiency.  Experimental Agriculture.  28:287-294. 1992
  • Assessment of yield loss caused by biotic stress on beans in Africa 1992
  • Soil fertility and bean nutrition in Uganda: A review and future research needs 1991
  • Farmers` participation in bean research in Uganda 1989
  • Diagnosis of soil fertility constraints in bean based cropping systems: review of research results 1988
  • Research methods for the diagnosis of soil fertility problems 1988
  • Review of bean responses to applied fertilizers in Africa 1988
  • Workshop on Soil Fertility Research for Bean Cropping Systems in Africa (1988, Addis Ababa, Ethiopia). Proceedings 1988

• document

  • Bean improvement for low fertility soils in Africa: The bilfa II 2000
  • Farmers` independent experimentation with green manure and/or cover crops: a component of participatory research for improving Ugandan farming systems 1999
  • Low soil phosphorus tolerance in common bean as affected by root architecture 1998
  • An investigation of alternative bean seed marketing channels in Uganda 1997
  • Diagnosis of nutritional disorders in beans using seed analysis 1997
  • Distribution of bean seed types in Eastern Africa 1997
  • Bean improvement for low fertility in Africa (BILFA): II. Low soil phosphorus availability 1995
  • Bean improvement for low fertility in Africa (BILFA): IV. Manganese toxicity 1995
  • Farmer participation in cultivar evaluation: The case of beans 1994
  • Farmer participatory research: Institutional considerations 1994
  • The Africa network for screening beans for tolerance edaphic stresses: an overview 1994
  • Bean agronomy and on-farm research in Uganda: A review and future research needs 1991

• review

  • Perennial grass ley rotations with annual crops in tropical Africa: A review.  Agronomy Journal. 2021