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As a creative and agile Iranian holding in the bitumen industry, DEJPA is among the first three producers in Iran with an export market, focusing on the field of bitumen and mulch. It is also known as a leading company in the field of technical and engineering services in the oil refining, bitumen and mulch industry, and it has made successful entries in the field of oil refining as business opportunities for the coming years.
Taking the lead in gaining market share in the current chain through increasing productivity, intelligence and innovation in supply, production and sales methods, as well as entering the oil refining chain in order to learn and build strategic capacity for the future of business.
40 YEARS OF COUNTINUES ACTIVITY IN BITUMEN PRODUCTION.
 
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Dejpa Bitumen

Petroleum Mulch for Sand Dune Stabilization in Baiji, Iraq

This study focuses on sand dune stabilization projects in the Baiji District of Iraq, aiming to reduce the mobility of shifting sands and mitigate wind erosion. Petroleum-based mulches were applied to create a surface crust that effectively immobilized sand movement. The findings confirmed the effectiveness of petroleum mulch in protecting infrastructure and farmland from encroaching dunes. The paper also discusses environmental concerns, mulch durability, and the potential for integrating vegetation in stabilization efforts.
Dejpa Bitumen

The effects of bitumen mulch and sowing date on the establishment and yield of oil-seed sunflower

This 2009 study by Harper and Ferguson, published by Cambridge University Press, evaluates the impact of petroleum mulch and sowing time on the establishment and yield of oilseed sunflower (Helianthus annuus L.). Results showed that petroleum mulch enhanced seedling establishment, conserved soil moisture, improved plant resilience under stress, and reduced weed competition. Additionally, optimal sowing times significantly influenced plant growth and yield. The combined use of petroleum mulch and appropriate sowing time led to notable yield improvements, offering a sustainable strategy for sunflower oil production.
Dejpa Bitumen

Effects of petroleum mulch on growth and yield of cotton

This three-year study conducted in Mississippi evaluated the effects of petroleum mulch on soil temperature, seedling emergence, weed control, and cotton yield. The findings revealed that petroleum mulch increased soil temperature in the germination zone, reduced soil crusting after rainfall, improved plant stands, and significantly boosted cotton yield—especially when applied in 6-inch wide bands. Combining the mulch with preemergence herbicides like trifluralin further enhanced weed control. However, the practical challenges of cost, handling, and application at scale remain important considerations.