Summary
The salt tolerance of mature ‘Santa Rosa’ plum trees was assessed on 20-year-old trees grown in the San Joaquin Valley of California. The experimental design consisted of six levels of irrigation water salinity (electrical conductivities of 0.3 to 8 dS/m) replicated five times with each replication consisting of ten trees. Salinity treatments imposed in March 1984 did not influence tree yields harvested in June 1984. In 1985, the second year of treatments, yield from the highest salt treatment (electrical conductivity of irrigation water, EC i , of 8 dS/m) was reduced by half; the number of fruit harvested was reduced 40%, and fruit size was reduced significantly. Foliar damage was so severe by the end of 1985 that nonsaline water was applied to the two highest salt treatments (EC i = 6 and 8 dS/m) in an attempt to restore tree vigor. In 1986 salt effects had become progressively worse on the continuing saline treatments. A linear piece-wise salt tolerance curve is presented for soil salinity values, expressed as the electrical conductivity of saturated extracts (EC e ) integrated to a soil depth of 1.2 m over a 2-year period. The salt tolerance threshold for relative yield (Y r ) based on 3 years of data was 2.6 dS/m and yield reduction at salinity levels beyond the threshold was 31% per dS/m (Y ir=100 − 31 [EC e − 2.6]j). Significant foliar damage occurred when leaf chloride concentrations surpassed 200 mmol/kg of leaf dry weight (0.7%). Sodium concentrations in the leaves remained below 10 mmol/kg (0.02%) until foliar damage became severe. This suggests that chloride was the dominant ion causing foliar damage.
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References
Anonymous (1986) California tree fruit agreement annual report. Sacramento, California
Bernstein L, Brown JW, Hayward HE (1956) The influence of rootstock on growth and salt accumulation in stone-fruit trees and almonds. Proc Am Soc Hort Sci 68:86
Bernstein L (1980) Salt tolerance of fruit crops. USDA Agric Inf Bull 292
Bernstein L, Hayward HE (1958) Physiology of salt tolerance. Annu Rev Plant Physiol 9:25
Francois LE, Maas EV (1978) Plant response to salinity: An indexed bibliography. USDA-ARS, ARM-W-6, Washington, D.C.
Francois LE, Maas EV (1985) Plant response to salinity: A supplement to an indexed bibliography. USDA, ARS, ARS-24, Washington, D.C.
Grimes DW, Wiley PL, Carlton AB (1982) Plum root growth in a variable-strength field soil. J Am Soc Hort Sci 107:990
Hayward HE, Long EM, Uhvits R (1946) Effect of chloride and sulfate salts on the growth and development of the Elberta peach on Shalil and Lovell rootstocks. USDA Tech Bull 922, Washington, D.C.
Horsfall JG, Barratt RW (1945) An improved grading system for measuring plant diseases. Phytopathology 35:655
James WC (1974) Assessment of plant diseases and losses. Annu. Rev. Phytopathology 12:27
Maas EV, Hoffman GJ (1977) Crop salt tolerance — current assessment. J Irrig Drain Div ASCE 103 (IR2):115
Muir CK (1986) Crop water use in California. Dep Water Res Bull 113-4, Apr 1986, Sacramento, California
Phene CJ, Meek DW, Davis KR, McCormick RL, Hutmacher RB (1985) Real time crop evapotranspiration and determination of crop coefficients. Proc Natl Conf Adv Evapotranspiration, Chicago, Dee 1985, p. 122
van Genuchten M Th, Hoffman GJ (1984) Analysis of crop salt tolerance data. In: Shainberg I, Shalhevet J (eds) Soil salinity under irrigation. Springer, Berlin Heidelberg New York (Ecological Studies, Vol 8), p. 258
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Hoffman, G.J., Catlin, P.B., Mead, R.M. et al. Yield and foliar injury responses of mature plum trees to salinity. Irrig Sci 10, 215–229 (1989). https://doi.org/10.1007/BF00257954
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DOI: https://doi.org/10.1007/BF00257954