Researchers studied weed control methods in rainy season rice. They found that using specific herbicides and practices like drum seeding and brown manuring can effectively control weeds and increase grain yield. These methods were shown to be economically viable and resulted in higher monetary returns and benefit:cost ratios compared to season-long weed-free conditions. The study also highlighted the nutrients that weeds remove from the soil, emphasizing the importance of effective weed control practices in rice cultivation.