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THE EFFECT OF HALOPHYTE PLANT CULTIVATION ON THE
AGROCHEMICAL PROPERTIES OF SOIL
Saliyeva Aygerim Maxashovna
1st-year Master's student in Agrochemistry specialty,
Karakalpakstan Institute of Agriculture and Agrotechnologies
https://doi.org/10.5281/zenodo.15674437
Abstract.
Halophyte plants play a vital role in improving the agrochemical
properties of saline soils. They reduce soil salinity, increase organic matter,
improve nutrient availability, and support microbial activity. This article
highlights their impact, showing how halophytes contribute to soil fertility and
sustainable agriculture in salt-affected areas.
Keywords:
halophytes, saline soils, soil fertility, organic matter, sustainable
agriculture.
Introduction.
Soil degradation due to salinization is a pressing global issue,
particularly in arid and semi-arid regions. As soil salinity increases, the
productivity of agricultural land declines, ultimately threatening food security.
However, the introduction of halophyte plants—species adapted to high-salinity
conditions—offers a potential solution. Halophytes not only survive in saline
environments but also contribute to improving the agrochemical properties of
soils. This article explores the influence of halophyte plants on soil
agrochemistry, including nutrient content, organic matter, pH regulation, and
microbial activity. Furthermore, it presents examples from both natural and
experimental studies, demonstrating how halophytes can be integrated into
sustainable land management strategies [5, 31-39].
To begin with, one of the most essential agrochemical characteristics of soil
is its salinity level, which directly affects water absorption by plant roots. Excess
salts in the root zone lead to osmotic stress, reducing crop yield and, in severe
cases, completely inhibiting plant growth. Halophytes are particularly valuable
in this context due to their ability to absorb, store, or excrete salts. For example,
halophytes like
Atriplex nummularia
and
Salicornia europaea
take up high
concentrations of sodium and chloride from the soil. These salts are either
stored in the vacuoles of plant cells or excreted through specialized salt glands.
As a result, the overall salt content in the root zone decreases over time.
Furthermore, when halophyte biomass is periodically harvested and removed, a
significant portion of the absorbed salts is physically exported from the system,
thus preventing re-salinization of the soil. Additionally, halophytes can stimulate
leaching by improving soil structure through root activity. The penetration of
their roots into compacted soils enhances water infiltration and drainage,
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helping to flush excess salts below the root zone. In areas like the Punjab region
in Pakistan, where saline soils dominate, researchers observed that planting
Atriplex spp.
for three years resulted in a 20–30% decrease in electrical
conductivity (EC), an important indicator of salinity.
Besides salt reduction, halophytes significantly influence the organic matter
content of soils. Organic matter, composed of decomposed plant and microbial
residues, is critical for nutrient cycling, soil fertility, and structure. As halophytes
grow, they contribute to biomass both above and below ground. When leaves
and stems fall or roots decay, they add carbon-rich material to the soil. For
instance, studies in the Aral Sea basin, one of the most saline and degraded
regions in Central Asia, demonstrated that growing
Salicornia europaea
increased soil organic carbon by up to 30% over a two-year period. This
increase in organic matter led to improved aggregate stability, moisture
retention, and soil porosity. Moreover, the decomposition of halophyte residues
promotes the proliferation of soil microorganisms, which are vital for nutrient
transformation. As microbial activity intensifies, processes such as nitrification,
denitrification, and decomposition of complex organic materials become more
efficient, further improving the agrochemical environment.
In saline soils, alkalinity is often a problem. High pH levels (above 8.5) can
lock up nutrients such as phosphorus, iron, and manganese, making them
unavailable to plants. However, halophytes can gradually alter pH conditions
through root exudates—organic acids and other compounds released during
root respiration. For example,
Tamarix articulata
, a tree-like halophyte species,
releases organic acids into the rhizosphere that help solubilize bound
phosphorus and micronutrients. A study in semi-arid regions of Rajasthan, India,
showed that after three years of
Tamarix
cultivation, the average soil pH
dropped from 9.1 to 8.0, which significantly improved nutrient uptake for
subsequent crops. Additionally, nitrogen dynamics are influenced by the
microbial interactions promoted by halophytes. Some species, such as
Sesbania
sesban
and
Casuarina equisetifolia
, form symbiotic relationships with nitrogen-
fixing bacteria like
Rhizobium
or
Frankia
. These bacteria convert atmospheric
nitrogen (N₂) into plant-available forms, enriching the soil in the process. The
resulting increase in soil nitrogen not only benefits the halophyte plants
themselves but also improves conditions for crop rotation and intercropping [3,
169-178].
A healthy soil microbial community is essential for maintaining the
agrochemical balance of soil. Microbes decompose organic matter, transform
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nutrients, and enhance soil structure. In saline conditions, however, microbial
diversity and activity are often severely reduced. Halophytes play a critical role
in restoring microbial life by supplying root exudates and organic residues that
serve as energy sources for microbes. According to research conducted in the
Yellow River Delta in China, plots planted with
Salicornia bigelovii
exhibited a
35% increase in microbial biomass compared to unplanted saline controls. Soil
respiration rates—a proxy for microbial activity—were also significantly higher,
indicating more robust microbial processes. Furthermore, halophytes contribute
to diversifying the soil microbiome. Their presence creates unique microhabitats
that support bacteria, fungi, and actinomycetes adapted to saline environments.
These microbes not only survive in high-salt conditions but also produce
substances such as exopolysaccharides, which bind soil particles and enhance
aggregate formation, improving soil physical and chemical properties.
Conclusion.
In summary, halophyte plants exert a considerable influence
on the agrochemical properties of saline and degraded soils. Through
mechanisms such as salt uptake, organic matter enrichment, pH moderation, and
enhancement of microbial activity, halophytes improve soil fertility and support
sustainable agricultural practices. With strategic application, halophytes can
serve as nature-based allies in promoting soil health, agricultural productivity,
and ecological resilience.
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