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Salinity and citriculture
1U. S. Salinity Laboratory, USDA-ARS, 4500 Glenwood Drive, Riverside, CA 92501, USA.
Tree Physiology
|March 1, 1993
Summary
Soil salinity severely impacts citrus crops like grapefruit, lemons, and oranges, reducing yields significantly. Choosing salt-tolerant rootstocks is crucial for mitigating ion toxicity and improving fruit production in saline soils.
Area of Science:
- Agricultural Science
- Plant Physiology
- Environmental Science
Background:
- Soil salinity is a major abiotic stress limiting global citrus production.
- Citrus species, particularly grapefruit, lemons, and oranges, exhibit high sensitivity to salt stress.
- Limited data exist on the quantitative impact of salinity on citrus fruit yields.
Purpose of the Study:
- To review and synthesize research on citrus responses to soil salinity.
- To discuss species-specific differences in salt tolerance.
- To explore the role of rootstocks in mitigating salt injury.
Main Methods:
- Literature review of agronomic and physiological responses of citrus to salinity.
- Analysis of published data on fruit yield reductions under varying salinity levels.
- Discussion of ion toxicity mechanisms and rootstock-mediated uptake control.
Main Results:
- Citrus fruit yields decline by approximately 13% for every 1.0 dS m(-1) increase in soil electrical conductivity (ECe) above a 1.4 dS m(-1) threshold.
- Excess chloride (Cl-) and sodium (Na+) accumulation leads to specific ion toxicities.
- Rootstock selection can effectively minimize ion toxicity by restricting uptake.
Conclusions:
- Citrus crops face significant yield losses due to soil salinity, necessitating careful management.
- Understanding species-specific salt tolerance and rootstock interactions is vital for sustainable citrus production.
- Further research should address interactions between salinity and other environmental stresses.