Asparagus. (2004) Oregon State Univ., Commercial Vegetable Production Guides.
Asparagus production in California. R. Mullen, K.S. Mayberry, F.F. Laemmlen. (1998) UC ANR Publication 7234.
Nitrogen fertilizer management in Arizona :: asparagus section. T.G. Doerge, R.L. Roth, B.R. Gardner. (1991) Univ. of Arizona.
Nutrient requirements and specific deficiency symptoms of vegetable species. R.J. Wood. (1996) Fertiliser Recommendations for Horticultural Crops, New Zealand Ministry of Agriculture and Fisheries.
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