The researchers studied how different types of fertilizers affected the growth and yield of two tomato hybrids in hot conditions. They used mineral fertilizers, organic poultry manure, and bio-fertilizers alone and in combinations. One hybrid showed increased shoot growth with mineral fertilizers, while the other had better flowering and fruit set with a mix of mineral, organic, and bio-fertilizers. The combination of all three types of fertilizers significantly improved growth and yield in both hybrids. Overall, both tomato hybrids performed well when grown with this specific fertilizer combination in high temperatures.