Crop Salt Tolerance Table: Plants for Saline Hot Soils

Imagine standing on agricultural land knowing that the salt concentration beneath you is enough to destroy any crop attempt. This is the reality for millions of farmers in arid regions — saline soils currently occupy a third of the world’s arable land, and that figure is projected to reach 50% in the coming decades. In the Arab world alone, saline soils represent 40% of cultivable land.

But not all saline land is barren. Knowing your crop salt tolerance table transforms a challenge into an opportunity. There are plants that tolerate salinity and heat, and there are proven modern techniques for reclaiming salt-affected soils.

This guide gives you everything you need to understand soil and water salinity, select the right crops, and apply effective treatment strategies — backed by Al-Qawafel’s more than 35 years of practical agricultural experience.

Causes of Soil and Water Salinity in Hot Arid Environments

Before searching for solutions, you need to understand the roots of the problem. Soil salinity in Saudi Arabia and across the broader Arab region is not a recent development — it is the accumulated result of natural and human factors that have interacted over decades, creating one of the most challenging agricultural environments in the world.

Natural Causes

• Rising saline groundwater tables, particularly in coastal areas and oases
• Intense evaporation that leaves salt deposits on the soil surface after water evaporates
• Soil parent material formed from mineral-rich rocks such as chlorides and sulfates
• Geological movements that push salt-laden water toward surface layers

Human-Induced Causes

• Irrigation with saline water or water with elevated salt content, causing progressive salt accumulation with each cycle
• Excessive use of chemical fertilizers that leave salt residues in the soil
• Poor agricultural drainage systems that prevent salts from moving away from the root zone
• Industrial effluent and saline wastewater contaminating adjacent farmland

En situation is compounded by hot climates, where high temperatures accelerate evaporation rates and concentrate salts in the soil more rapidly. This is precisely why the crop salt tolerance table is such a critical planning tool — it helps match the right crop to the actual salinity level of each environment.

For a full explanation of what causes soil salinity and how to diagnose it on your land, see: Causes of Soil Salinity — A Farmer’s Guide

Salinity Measurement Standards and the Plant Tolerance Scale

To use the crop salt tolerance table effectively, you first need to understand how salinity is measured. The two go hand in hand in any serious approach to farming in challenging environments.

How to Read Measurement Units — EC and ppm

Approximate conversion: 1 dS/m ≈ 640 ppm

Salinity Levels and Their Effect on Crops

Crop Salt Tolerance Table — Low, Medium, and High Tolerancia

The classification of crops in the salt tolerance table is based on their ability to sustain yield at different salt concentrations:

Important note: “Tolerance” does not mean the crop will perform at its best at the upper limit of its range. Yield decreases progressively as salinity increases — a crop at its maximum tolerance threshold may produce very little. Always target the lowest possible salinity level to achieve the best harvest. The crop salt tolerance table is a planning reference, not a guarantee of output.

Best Trees and Ornamental Plants That Tolerate Salinity and Heat

When searching for plants that tolerate salinity and heat, a distinctive group of trees and landscape plants has consistently proven its worth under the harshest environmental conditions.

Native Trees and Date Palms

These trees are the backbone of agriculture in difficult environments, combining exceptional salt and heat tolerance.

Date palm (all varieties): En undisputed king of salt-tolerant trees. Can tolerate soil salinity up to 4.0 dS/m and irrigation water salinity up a 2.7 dS/m.

Tamarisk (Athel — Tamarix aphylla): An exceptional salt-tolerance champion — can withstand water salinity exceeding 15 dS/m, making it ideal for salt flats and as a windbreak tree in coastal and desert environments.

Sidr (Ziziphus spina-christi): A deep-rooted native tree that tolerates some of the harshest salinity conditions found in desert regions.

Ghaf (Prosopis cineraria): A highly resilient native tree with minimal water requirements — one of the most important plants tolerating salinity and heat in the Arabian Peninsula and a key species for dryland agroforestry.

Ornamental Plants and Turf

Bougainvillea: One of the most widely used ornamental plants tolerating salinity and high heat. Prolific flowering, low maintenance, and adaptable to coastal environments.

Ornamental cacti: Desert plants by nature — unaffected by soil drought or salinity, and they add a contemporary aesthetic to arid landscapes.

Seashore paspalum (Paspalum vaginatum): The premier choice for green turf irrigated with saline water. Widely regarded as one of the most important salt-tolerant turfgrasses available for warm-climate landscaping.

Salt-Tolerant Árboles frutales

Olive: One of the most salt-tolerant fruit trees available — withstands soil salinity up to 2.7 dS/m and irrigation water up to 1.8 dS/m.

Pomegranate: Similar salt tolerance to olive — withstands up to 2.7 dS/m in soil.

Fig: Tolerates soil salinity up to 2.7 dS/m and water salinity up to 1.8 dS/m — a solid choice for challenging environments where other fruit trees fail.

Salt Tolerance of Field Crops and Verduras

On saline land, success does not come from planting any crop — it comes from knowing which field crops and vegetables will deliver an acceptable yield despite the salinity, and which will result in certain loss.

Classification by Tolerance Level

High tolerance (EC > 7.0 dS/m): Barley, sugar beet, and cotton. Ideal choices for land with elevated salinity — they produce an acceptable yield under conditions where other crops would fail entirely.

Medium tolerance (EC 3.0 – 7.0 dS/m): Wheat, tomato, cucumber, potato, soybean, alfalfa, watermelon, and rice. Economically viable on medium-to-high salinity land, provided irrigation management and soil conditions are improved.

Low tolerance (EC < 3.0 dS/m): Green beans, onion, sweet corn, pepper, and fava bean. These crops require low-salinity soil and fresh irrigation water. Planting them on saline land above their minimum threshold — without comprehensive prior soil treatment — is not recommended.

This classification enables farmers to make data-driven decisions during seasonal planning, with the understanding that productivity decreases progressively as salinity approaches the upper limit of each category.

Methods for Treating Soil and Water Salinity

Salinity is not an inevitable fate — it is a challenge that can be overcome with systematic, practical steps combining modern irrigation technology and organic amendments that have proven effective in reclaiming degraded land.

Smart Irrigation Management

Deep irrigation to flush salts below the root zone, improved drainage infrastructure to prevent salt accumulation, and reducing dependence on saline water sources wherever alternative sources are available.

Organic and Chemical Soil Amendments

Agricultural gypsum: Replaces sodium ions with calcium ions, directly improving soil structure and increasing water permeability — the foundational treatment for sodic soils.

Humic acid: Reduces the harmful effect of salts on the root zone, increases the soil’s capacity to retain water and nutrients, and extends the availability of plant food between irrigation cycles.

For a full guide to the fertilizers and amendments used to treat soil salinity — including recommended doses of gypsum, potassium humate, phosphoric acid, and organic fertilizers — see: Fertilizers That Treat Soil Salinity

Conservation Agriculture

Planting salt-tolerant crops such as barley and cotton to condition and rehabilitate the soil before introducing more sensitive varieties. Using halophyte plants that absorb and store salts in their own tissue, progressively reducing soil salt concentration over time.

Frequently Asked Questions

What does salt tolerance mean for a plant?
It is the plant’s ability to complete its life cycle and produce a crop — even if below its optimal potential — in the presence of a defined salt concentration in the soil or irrigation water.

Can mango be grown on saline land?
Mango is one of the most salt-sensitive fruit crops. It is not recommended for saline land unless the soil has undergone comprehensive treatment to bring salinity levels well within the low-tolerance threshold.

How do I choose the right plants for my saline land?
Start with an accurate soil and water analysis to determine the salinity level in EC and ppm. Then use the crop salt tolerance table to identify plants matched to your actual salinity reading. Always consult agronomic specialists — such as the Al-Qawafel team — for customized recommendations based on your specific field conditions.

Can saline irrigation water be treated?
Yes, through several methods: reverse osmosis and ion exchange filtration systems; chemical treatments that react with and remove salt ions; and biological processes using microorganisms to break down salt compounds. The right method depends on the volume of water, the salinity level, and the crop being irrigated.

Saline soil is not the end of the road — it is a new beginning that demands deep understanding and intelligent management. Using the crop salt tolerance table as a practical planning reference, any farmer can turn this challenge into a genuine opportunity: by selecting plants that tolerate salinity and heat, applying modern irrigation techniques, and using organic and chemical amendments such as agricultural gypsum and humic acid to restructure the soil and reduce the harmful impact of accumulated salts.

At Al-Qawafel, we believe every piece of land has productive potential. We provide comprehensive solutions that begin with soil analysis, continue with high-quality soil amendment products, and extend to long-term reclamation planning. Don’t let salinity hold back your ambitions — contact our specialist team at alqawafel.com to turn your land into a productive farm.