The researchers tested different watering and fertilizing schedules for growing tomatoes in a greenhouse. They found that watering and fertilizing every 6 days resulted in the best tomato yield while using 40% less water compared to the standard method. This method helped distribute water and nutrients more effectively in the soil, leading to higher tomato yields. Overall, watering and fertilizing every 6 days can be a good way to save water and still grow healthy tomatoes in a greenhouse.