Brassica cover crops: impacts on plant nutrition and pest management. R. Smith, A. Barber. (2004) CPSC.
Cover crops and compost amendments for organic grape production. R. Walser, M. Weiss, S. Guldan, A. Ulery, R. Flynn. (2007) WNMC.
Developing testing protocols to ensure the authenticity of fertilizers for organic agriculture. W.R. Horwath. (2010) CPSC.
Greensand as a soil amendment. J.R. Heckman, J.C.F. Tedrow. (2004) Better Crops 88(2): 16-17.
Humic materials for agriculture. R.L. Mikkelsen. (2005) Better Crops 89(3): 6-9.
Leguminous cover crop residues in orchard soils. R. Smith, Z. Wu, R.L. Bugg, A. M. Berry. (2002) CPSC.
Managing potassium for organic crop production. R. Mikkelsen. (2008) Better Crops 92(2): 26-29.
Managing potassium for organic crop production. R. Mikkelsen. (2007) WNMC.
Meeting the phosphorus requirement on organic farms. N. Nelson, R. Mikkelsen. (2008) Better Crops 92(1): 12-14.
Nitrogen and carbon mineralization dynamics of manures and composts. T.K. Hartz, J.P. Mitchell, C. Giannini. (2000) HortScience 35(2):209-212.
Nitrogen availability from high-nitrogen-containing organic fertilizers. T.K. Hartz, P.R. Johnstone. (2006) HortTechnology 16(1):39-42.
Nitrogen availability from liquid organic fertilizers. T.K. Hartz, R. Smith, M. Gaskell. (2010) HortTechnology 20(1):169-172.
Nitrogen cycling and partitioning under alternative organic orchard floor management strategies. L. Hoagland, L. Carpenter-Boggs, D. Granatstein, M. Mazzola, F. Peryea, J. Smith, J. Reganold. (2007) WNMC.
Nitrogen sources for organic crop production. R. Mikkelsen, T.K. Hartz. (2008) Better Crops 92(4): 16-19.
Nutrient exclusivity in organic farming--does it offer advantages? H. Kirchmann, M.H. Ryan (2005) Better Crops 89(1): 24-29.
Organic nutrients. A.E. Ludwick, A.M. Johnston. (2002) Better Crops 86(2): 8-9.
Predicting nitrogen availability from organic amendments: laboratory, field and computer simulation. E.S. Gale, D.M. Sullivan, D. Hemphill, C.G. Cogger, A.I. Bary, E.A. Myhre. (2005) WNMC.
Productivity of organic cropping systems. T.W. Bruulsema, D.W. Dibb, H.F. Reetz, Jr., P.E. Fixen (2003) Better Crops 87(1): 16-18.
Soil fertility management for organic crop. M. Gaskell, R. Smith, J. Mitchell, S.T. Koike, C. Fouche, T. Hartz, W. Horwath, L. Jackson. (2006) UC ANR Publication 7249.
Soil management and soil quality for organic crops. J. Mitchell, M. Gaskell, R. Smith, C. Fouche, S.T. Koike.(2000) UC ANR Publication 7248.
Using manure and compost as nutrient source for vegetable crops. C.J. Rosen, P.M. Bierman. (2005) University of Minnesota Extension Service.
Cornell University :: organic
National Sustainable Agriculture Information Service (ATTRA) :: sources of organic fertilizers and amendments
North Carolina State University :: organic
Oregon State University :: organic agriculture program
Organic Materials Review Institute
University of California :: Sustainable Agricultural Research and Education Program (SAREP) :: organic farming research and information
University of Florida Extension :: organic production
Washington State University :: Center for Sustaining Agriculture and Natural Resources :: organic agriculture program
CPSC = California Plant and Soil Conference
FFTC ASPAC = Food & Fertilizer Technology Center for the Asian and Pacific Region
FREP = Fertilizer Research and Education Program completed project
UC ANR = University of California Agriculture and Natural Resources
UF IFAS = University of Florida Institute of Food and Agricultural Sciences
WNMC = Western Nutrient Management Conference
WTFRC = Washington Tree Fruit Research Commission