1. Sanchez, C. A., and T. A. Doerge. 1999. Using nutrient uptake patterns to develop efficient nitrogen management strategies for vegetables. HortTechnology 9:601-606.

2. Moyo, C. C., D.E. Kissel, M.L. Cabrera. 1989. Temperature effects on soil urease activity. Soil Biology and Biochemistry 21:935-938.

3. Sanchez, CA. 2000. Response of lettuce to water and N on sand and the potential for leaching of nitrate-N. HortScience 35:73-77.

4. Broadbent, F. E. 1951. Denitrification in some California soils. Soil Sci. 72:129–137.

5. Girkin, N. T. and H. V. Cooper. 2023. Nitrogen mineralization and immobilization. In Encyclopedia of Soils in the Environment (Second Edition).

6. Hartz, T.K. 2006. Vegetable Production Best Management Practices to Minimize Nutrient Loss. HortTechnology 16:398-403.

7. Doerge, T.A., R.L. Roth, and B.R. Gardner. 1991. Nitrogen fertilizer management in Arizona. Univ.of Arizona, College of Agriculture, Rpt. 191025.

8. Sanchez, C. A., D. Zerihun, and K. L. Farrell-Poe. 2008. Management guidelines for efficient irrigation of vegetables using closed-end level furrows. Agricultural Water Management. 96:43-52.

9. Sanchez, C. A., and A. French. 2023. Quantitative assessments of water and salt balance for cropping systems in the Lower Colorado River Region. A report for the Yuma County Agriculture Coalition. (https://desertagsolutions.org/sites/desertagsolutions.org/files/2024-04…).

10. YCEDA. https://desertagsolutions.org/research-areas-and-initiatives/increasing…

11. Stivers, L. J., L. E. Jackson, and G. S. Pettygrove. 1993. Use of nitrogen by lettuce, celery, broccoli, and cauliflower: A Literature review. California Department of Food and Agriculture, Sacramento, California.

12. Geisseler, D., 2016. Nitrogen concentrations in harvested plant parts: A literature review Report to the Kings River Watershed Coalition.
(also posted at http://geisseler.ucdavis.edu/Guidelines/Geisseler_Report_2016_12_02.pdf).

13. Geisseler, D., and W. R. Horwath. Crop Nitrogen Uptake and Partitioning. https://www.cdfa.ca.gov/is/ffldrs/frep/FertilizationGuidelines/N_Uptake…

14. Sanchez, C. A.. Various unpublished data.

15. Bronson, K. F., R. Norton, and J. C. Silvertooth. 2020. Revising petiole nitrate sufficiency/deficiency guidelines for irrigated cotton in the Desert Southwest. Soil Sci.Soc. Am. J. 85:893–902.

16. Knowles, T. C., T. A. Doerge, and M. J. Ottman. 1992. Improved nitrogen management in irrigated Durum wheat using stem nitrate analysis: I. Nitrate uptake dynamics. Agron. J. 83:346-352.

17. Hartz, T.K., W. E. Bendixen, and L. Wierdsma. 2000. The value of presidedress soil nitrate testing as a nitrogen management tool in irrigated vegetable production. HortScience 35:651–656.

18. Breschini, S.J., and T. K. Hartz. 2002. Presidedress soil nitrate testing reduces nitrogen fertilizer use and nitrate leaching hazard in lettuce production. HortScience, 37:1061-1064.

19. Krueskopf, H.H., J. P. Mitchell, T. K. Hartz, D. M. May, E. M. Miyao, and M. D. Cahn. 2002. Presidedress soil nitrate testing identifies processing tomato fields not requiring sidedress N fertilizer. HortScience 37:520-524.

20. Hartz, T. K. 1994. A quick test procedure for soil nitrate‐nitrogen. Communications in Soil Science and Plant Analysis, 25:5-6, 511-515.

21. https://www.cdfa.ca.gov/is/ffldrs/frep/pdfs/NitrateQuickTestWeb.pdf

22. Gardner, B.R., and D.W. Pew. 1979. Comparison of various nitrogen sources for the fertilization of winter-grown head lettuce. J. Am.Soc.for Hort. Sci. 104, 534-536.

23. Stark, J.M. 1996. Modeling the temperature response of nitrification. Biogeochemistry 35:433–445.

24. Cole C. V., S. R. Olsen and C. O. Scott. 1953. The nature of phosphate sorption by calcium carbonate. Soil Sci. Soc. Am. Proc.17:352–356.

25. Griffin R. A., and J. J. Jurinak. 1973. The interaction of phosphate with calcite. Soil Sci. Soc. Am. Proc. 37:847–850.

26. Holford I.C.R. and G. E. G. Mattingly. 1975. Phosphate sorption by Jurassic Oolitic limestones. Geoderma 13:257–264.

27. Porter, P. S, and C. A. Sanchez. 1992. The effect of soil properties on phosphorus sorption by Everglades Histosols. Soil Sci. 154:387-398.

28. Lindsay W.L. 1979. Chemical Equilibrium in Soil. Wiley Interscience, New York.

29. Lindsay W. L., and I. F. Stephenson. 1959. Nature of the reactions of monocalcium phosphate monohydrate in soils. II. Dissolution and precipitation reactions involving iron, aluminum, manganese and calcium. Soil Sci. Soc. Am. Proc. 26: 446–452.

30. Gowariker V, V. N. Krishnamurthy, S. Gowariker, M. Dhanorkar, and K. Paranjape. 2009. The Fertilizer Encyclopedia. John Wily & Sons, Hoboken, NJ.

31. Sanchez, C. A. 2006. Phosphorus. pp 51-90. In: A. V. Barker and D. J. Pilbeam (eds.). Handbook of Plant Nutrition CRC Press. Taylor and Francis, Boca Raton.

32. Olsen, S. R. and Sommers, L. E. 1982. Phosphorus. pp. 403-430. In: A. L. Page, et al. (eds.) Methods of soil analysis: Part 2. Chemical and microbiological properties. Agron. Mongr. 9. 2nd ed. ASA and SSSA, Madison, WI.

33. Johnstone, P, T. K. Hartz, M Cahn, and M. R. Johnstone,. 2005. Lettuce response to phosphorus fertilization in high phosphorus soils. HortScience 40:1499-1503.

34. Sanchez, C. A., V. L. Guzman, and R. T. Nagata. 1990. Evaluation of sidedress fertilization for correcting nutritional deficits in crisphead lettuce produced on Histosols. Proc. Fla. State Hort. Soc. 103:110-113.

35. Sanchez, C. A., S. Swanson, and P. S. Porter. 1990. Banding P to improve fertilizer use efficiency of lettuce. J. Am. Soc. Hort. Sci. 115:581-584.

36. Sanchez, C. A., P. S. Porter, and M. F. Ulloa. 1991. Relative efficiency of broadcast and banded P for sweet corn produced on Histosols. Soil Sci. Soc. Am. J. 55:871-875.

37. Doll, E.C. and R. E. Lucas. 1973. Testing soil for potassium, calcium and magnesium. p. 133-152. In: L.M. Walsh and J.D. Beaton. (ed.) Soil testing and plant analysis. SSSA, Madison, WI.

38. California Crop Fertilization Guidelines. https://www.cdfa.ca.gov/is/ffldrs/frep/FertilizationGuidelines/

39. California Plant Health Association, 2002. Western Fertilizer Handbook 9th edition. Interstate Publishers, Inc.

40. Maynard, D.N., Hochmuth, G.J., 2007. Knott's Handbook for Vegetable Growers 5th Edition. John Wiley & Sons, Inc. ISBN: 978-0-471-73828-2.

41. Reisenauer, H.M., Quick, J., Voss, R.E., 1976. Soil test interpretive guides. In: Reisenauer, H.M. (Ed.). Soil and Plant-Tissue Testing in California. University of California Cooperative Extension Bulletin 1879. pp. 38-40.

42. Hartz, T. K., Soil testing for nutrient availability and interpretation for California vegetable crops.
https://vric.ucdavis.edu/pdf/fertilization_Soiltestingfornutrientavaila…

43. Smith, R., and S Pettygrove. 2011. Potassium fertility of Salinas Valley soils. Salinas Valley Agriculture.

44. Babcock, E. L., and J C. Silvertooth. 2012. Soil Testing and Plant Analysis Relationships for Irrigated Chile Production. Communications in Soil Science and Plant Analysis 43:10.1080/00103624.2012.711879.

45. Hartz, T.K., E. M. Miyao, R. J. Mullen, M. D. Cahn, J. Valencia, and K. L. Brittan, 1999. Potassium requirements for maximum yield and fruit quality of processing tomato. J. Am. Soc. for Hort. Sci. 124:199–204.

46. Hartz, T.K., E. M. Miyao, R. J. Mullen, and M. D. Cahn. 2001. Potassium fertilization effects on processing tomato yield and fruit quality. Acta Horticulturae 542, 127-133.

47. Hartz, T.K., Johnstone, P.R., Francis, D.M., Miyao, E.M., 2005. Processing tomato yield and fruit quality improved with potassium fertigation. HortScience 40, 1862-1867.

48. Galadima, A., J.C. Silvertooth, and E.R. Norton. 1998. Potassium fertilization of Upland and Pima cotton. (1991-1995, a five-year project review). Cotton, A College of Agriculture Report. Series P-112, University of Arizona, Tucson, AZ. p. 490-503.

49. Silvertooth. Personal communication.

50. Unruh, B. L., J. C. Silvertooth, and D. M. Hendricks. 1994. Potassium fertility status of several Sonoran Desert soils. Soil Sci. 158:435-441.

51. Galadima, A. and J.C. Silvertooth. 1998. Mathematical models of potassium release kinetics for Sonoran Desert soils of Arizona. Cotton, A College of Agriculture Report. Series P-112. University of Arizona, Tucson, AZ. p. 504-516.

52. Galadima, A., J.C. Silvertooth, and C.A. Sanchez. 1999. Mathematical models of potassium release kinetics for Sonoran Desert soils of Arizona. 91st Annual Meeting, Am. Soc. of Agron., Salt Lake City, UT., Agron. Abstr., p. 214.

53. Harmer, P. M., E. Benne, and L Erwin. 1945. Sodium as a crop nutrient. Soil Sci. 60: 137-148.

54. Harmer, P.M., E. J. Benne, W. M. Laughlin, M. Winston, and C. Key. 1953. Factors affecting crop response to sodium applied as common salt to Michigan muck soil. Soil Sci. 76: 1-18.

55. Costigan, P. and G. P. Mead. 1987. The requirements of cabbage and lettuce seedlings for potassium in the presence and absence of sodium J. of Plant Nut. 10:385-401.

56. Figdore, S. S., G. C. Gerloff, and W. H. Gabelman. 1989. The effect of increasing NaCl levels on the potassium utilization efficiency of tomatoes grown under low-K stress. Plant and Soil 119: 295–303.

57. Burns, I. G. and W. Hutsby. 1986. The uptake of Na and its redistribution between leaves during the development and alleviation of K deficiency. J. of the Sci. of Food and Agric. 37:623-631.

58. Sanchez, C. A., A. Faber, and M Lockhart. 1992. Potassium and sodium interrelations in celery. HortScience 27(6) 665a-665.
https://doi.org/10.21273/HORTSCI.27.6,665a

59. Sanchez, C. A., and J. C. Silvertooth. 1996. Managing saline and sodic soils for the production of horticultural crops. HortTechnology 6:99-107.

60. Carter, M. L., G, R. Webster, and R. R, Cains. 1979. Calcium deficiency in some solonetzic soils of Alberta. J. Soil Sci. 30:161-174.

61. Rhoades, J.D. 1990. Diagnosis of salinity problems and selection of control practices: Chapter 1. An overview. In K.K. Tanji (Ed.), Agricultural salinity assessment and management, Reston, VA: American Society of Civil Engineers.

62. Suarez, D. L. 1981. Relation between pHc and sodium adsorption ratio (SAR) and an alternative method of estimating SAR of soil and drainage waters. Soil Sci. Amer. J. 45: 469‐475.

63. Xu G.H., H. Magen, J. Tarchitzky and U. U Kafkafi. 2000. Advances in chloride nutrition of plants. pp. 97–150. In: Sparks D.L., (ed.). Advances in Agronomy. Volume 68. Academic Press; San Diego, CA, USA: 2000.

64. Hornek, D. A., D. M. Sullivan, J. S. Owen, and J.M. Hart. 2011. Soil test interpretation guide [EC1478]. Corvallis: Oregon State University Extension Service.
(available at https://extension.oregonstate.edu/sorec/sites/default/files/soil_test_i…)

65. Maas, E.V. 1990. Crop salt tolerance. Chapter 13. In K.K. Tanji (Ed.), Agricultural salinity assessment and management, Reston, VA: American Society of Civil Engineers.

66. Rhoades, J.D. (1974). Drainage for Salinity Control. In J. Van Schilfgaarde (Ed.), Drainage for Agriculture pp. 433-468.

67. Hoffman, G. 1990. Leaching fraction and root zone salinity control. Chapter 12. In K.K. Tanji (Ed.), Agricultural salinity assessment and management, Reston, VA: American Society of Civil Engineers.

68. Ayers, R. S. and D. W. Wescot. 1994. Water quality for agriculture. FAO Irrigation and Drainage Paper 29 Rev. 1.

69. Flynn, R. Interpreting soil tests. Unlock the secrets of your soil. New Mexico State University Circular 676.

70. USEPA. Estimating risk from contaminants contained in agricultural fertilizers. https://archive.epa.gov/epawaste/hazard/web/pdf/report.pdf

71. Lindsay, W. L. and Norvell, W. A. 1978. Development of a DTPA soil test for zinc, iron, manganese, and copper. Soil Sci. Soc. Am. J. 42:421-428.

72. Walworth, J. 2013. Recognizing and treating iron deficiency in the home yard. University of Arizona Cooperative Extension AZ 1415.
https://repository.arizona.edu/handle/10150/267537

73. Keren, R. 1996. “Boron.” pp. 603-626. In DL Sparks et al, (eds). Methods of Soil Analyses. Part 3: Chemical Methods. Soil Science Society of America Book Series No 5, Madison, WI.

74. Smith, H. V. 1949. Boron as a factor in Arizona Agriculture. Univ.of Arizona, College of Agriculture. Tech. Bull. 118.

75. Ryan, J., S. Miyamoto, and J. L. Stroehlein. 1977. Relation of solute and sorbed boron to the boron hazard in irrigation water. Plant and Soil 47:253-256.

76. Mortvedt, J. J., and J. D. Beaton. 1995. Heavy metal and radionuclide contaminants in phosphate fertilizers. Scope-scientific Committee on Problems of the Environment International Council of Scientific Unions, 54, 93-106.

77. Washington Department of Agriculture. Fertilizer Database. https://agr.wa.gov/departments/pesticides-and-fertilizers/fertilizers/f…

78. Ryszko, U., P Rusek, and D. Kołodynska. 2023. Quality of phosphate rocks from various deposits used in wet phosphoric acid and P-fertilizer production. Materials. 16:793. https://doi.org/10.3390/

79. Hartz, T. K., Cahn, M. D., Smith, R. F. Efficient Nitrogen Fertility and Irrigation Management of Cool-Season Vegetables in Coastal California, 2018, UC-ANR publications. (https://ucanr.edu/sites/StrategicInitiatives/files/301160.pdf)

80. Sanchez, C. A., and N. M. El-Hout. 1995. Response of different lettuce types to fertilizer phosphorus. HortScience. 30:528-531.

81. Nagata, R. T., C. A. Sanchez, and F. J. Coale. 1992. Crisphead lettuce cultivar response to fertilizer phosphorus. J. Amer. Soc. Hort. Sci. 117:721-724.

82. Sanchez, C. A., R. L. Roth, and B. R. Gardner. 1994. Irrigation and nitrogen management for sprinkler-irrigated cabbage on sand. J. Am. Soc. Hort. Sci. 119:427-433.

83. Sanchez, C. A., H. W. Burdine, and V. L. Guzman. 1990. Soil testing and plant analysis as guides for the fertilization of celery on Histosols. Soil Crop Sci. Soc. Fla. Proc. 49:69-72.

84. Sanchez, C. A., and H. W. Burdine. 1989. Soil testing and plant analysis as guides for the fertilization of escarole and endive on Histosols. Soil Crop Sci. Soc. Fla. Proc. 48:37-40.

85. Sanchez, C. A. 1989. Soil testing and fertilizer recommendations for crop production on organic soils in Florida. Univ. of Florida (Technical) Bulletin 876.

86. Biscaro, A., Cahn, M., Smith, R., Hartz, T., 2014. Nitrogen, phosphorus and potassium uptake patterns of fresh-market onion production in southern California. American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America (ASA, CSSA, and SSSA) International Annual Meetings, Long Beach CA, ASA, CSSA, and SSSA.

87. Soto-Ortiz, R., 2008. Crop phenology, dry matter production, and nutrient uptake and partitioning in cantaloupe (Cucumis melo L.) and chile (Capsicum annuum L.). Dissertation.

88. Arizona Farm Bureau. 2014. https://www.azfb.org/Article/Arizona-Agriculture-Grows-the-Best-Sweet-C…

89. Sanchez, C. A., H. W. Burdine, and F. S. Martin. 1989. Yield and quality responses of three sweet corn hybrids to fertilizer phosphorus. J. Fert. Issues. 6:12-24.

90. Silvertooth, J. C., R. Soto-Ortiz, and A. Galadima. 2008. NPK inputs at optimal growth stage for critical for maximizing yield in irrigated chiles. Fluid Journal 16: No. 3. Issue 3 61.

91. Western Fertilizer Handbook. 2nd Horticultural Edition. California Department of Food and Agriculture. Interstate Publishers Inc.

92. Arizona Farm Bureau. https://www.azfb.org/Article/Arizona-Agricultures-Tomatoes-are-Tops-in-…

93. Jones, J. B., B. Wolf, and H. A. Mills. 1991. Plant analysis handbook. A practical sampling, preparation, analysis, and interpretation guide. Mico-Macro Publishing. Athens, GA.

94. Wolf, B. Diagnostic Techniques for improving crop production. 1996. Haworth Press, Inc. Bingham, NY.

95. Doerge, T A., K. M. Pritchard, and T. W. McCreary. 1992. Nitrogen Management in Drip Irrigated Leaf Lettuce, Spinach and Green Crops. Vegetable Report.
https://repository.arizona.edu/bitstream/handle/10150/214500/370093-032…

96. Hall, A. D. 1905. The analysis of the soil by means of the plant. J. Agric. Sci. 1:65-88.

97. Macy, P. 1936. The quantitative mineral nutrient requirements of plants. Plant Physiol. 11:749-764.

98. Walsh, L. M., and J. D. Beaton. 1973. Soil testing and plant analysis. Soil Sci. Soc. Am. Inc., Madison, WI.

99. Lorenz, O. A., and K. B. Tyler. 1983. Plant tissue analysis of vegetable crops. P. 24-29. In: H. M. Reisenar (ed.). Soil and Plant testing in California. Univ. Calif. Coop. Ext. Bull 1879.

100. Hochmuth, H., D. Maynard, C. Vavrina, and E. Hanlon. 1991. Plant tissue analysis and interpretation for vegetable crops in Florida. Fla. Coo. Ext. Serv. Special Series. SSVEC.

101. Campbell, R. Y. (ed.) 2000. Reference sufficiency ranges for plant analysis in the southern region of the United States. Southern Cooperative Series Bulletin #394. (Updates 2013).

102. Sanchez, C. A., H. W. Burdine, V. L. Guzman, and C. B. Hall. 1988. Yield, quality, and leaf nutrient composition of crisphead lettuce as affected by N, P, and K on Histosols. Proc. Fla. State Hort. Soc. 101:346-350.

103. Sanchez, C. A., G. H. Snyder, and H. W. Burdine. 1991. DRIS evaluation of the nutritional status of crisphead lettuce. HortScience. 26:274-276.

104. Hartz, T.K., Miyao, E.M, Valencia, J.G., 1998. DRIS evaluation of the nutritional status of processing tomato. HortScience 33, 830-832.

105. Hartz, T.K., P. R. Johnson, E. Williams, and R. F. Smith. 2007 Establishing lettuce leaf nutrient optimum ranges through DRIS analysis. HortScience. 42:143-146.

106. Yuma County Agriculture Water Coalition. 2015. A case study in efficiency-Agriculture Water Use in the Yuma Area.
(available at https://yumafreshveg.com/yuma-ag-water/)

107. Arizona LMGA. https://www.arizonaleafygreens.org/_files/ugd/69414f_514afcfc4721466797…

108. Hartz, T.K., and G. J. Hockmuth. 1996. Fertility Management of Drip Irrigated Vegetables. HortTechnology. 168-172.

109. Burt, C., M. Holman, K. O'Connor, and T. Ruehr. 2018. Fertigation 2nd Edition Irrigation Association.

110. Dominika M., and A. Siczek. 2021. Effectiveness of the use of urease inhibitors in agriculture: a review. Int. Agrophys 35:197-208.

111. Slangen, J., and P. Kerkhoff,. 1984. Nitrification inhibitors in agriculture and horticulture: A literature review. Fertilizer Research 5:1–76.
https://doi.org/10.1007/BF01049492

112. USDA. NRCS. https://www.nrcs.usda.gov/conservation-basics/natural-resource-concerns….

113. Arizona Revised Statutes 49-247. https://www.azleg.gov/viewdocument/?docName=https://www.azleg.gov/ars/4…

114. Arizona Revised Statutes 49-241. https://www.azleg.gov/viewdocument/?docName=https://www.azleg.gov/ars/4…

115. Arizona Department of Environmental Quality. https://static.azdeq.gov/wqd/reclaimed_water_rules_dec17.pdf

116. California State Water Resources Control Board. https://www.waterboards.ca.gov/centralvalley/water_issues/irrigated_lan…

117. California State Water Resources Control Board. https://www.waterboards.ca.gov/centralcoast/board_info/agendas/2019/mar…

118. Bard Unit Coalition Group. https://bardwaterdistrict.com/bucg/