Apple and pear nutrition. J. Bright. (2005) New South Wales Dept. of Primary Industries, Primefact 85.
Nitrogen and phosphorus fertigation on pears. F. Yin, C.F. Seavert, J. Bai. (2007) WNMC.
Nitrogen nutrition of pears grown under differing soil and environmental conditions. T. Righetti. (2003) WTFRC.
Pears. J. Hart, T. Righetti, B. Stevens, B. Stebbins, P. Lombard, D. Burkhart, P. Van Buskirk. (1997) Oregon State Univ. Extension Service, Fertilizer Guide 59.
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