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.