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This study examined the influence of petroleum mulch on the performance of several herbicides in weed control. Results indicated that petroleum mulch can alter soil surface conditions—such as temperature and moisture—affecting herbicide efficiency. In some cases, mulch increased herbicide persistence and effectiveness, while in others it reduced impact due to changes in penetration and distribution. The research highlights the importance of aligning mulch type and herbicide selection with proper timing and application methods.

This Utah State University research (1968) investigated the effects of petroleum mulch on tomato seed germination and yield. Results showed that oil mulch improved soil moisture retention, reduced evaporation, and enhanced soil temperature, which accelerated germination rates. Final yield (both fruit number and weight) was higher in mulch-treated plots compared to controls. The study emphasized the importance of proper mulch layer thickness and application management to maximize benefits and avoid potential seed damage.

This research in California investigated the effects of petroleum mulch on row crops such as corn, beans, and cotton. The results indicated that petroleum mulch reduced soil moisture evaporation, improved soil surface temperature conditions, and accelerated germination. In some cases, crop yields increased due to improved growth conditions and reduced water stress. However, the effectiveness depended on environmental factors such as soil type, temperature, and rainfall. The study also highlighted the importance of assessing environmental impacts and optimizing application rates.