The study looked at how much water tomato plants need when grown in a solar greenhouse with different irrigation levels. They measured the water used by the plants and analyzed factors like sunlight and humidity that affect water needs. They found that plants under full irrigation used 16-23% more water than those under deficit irrigation. The amount of water used by the plants varied throughout the growing season. The researchers developed a model to estimate water needs at different stages of plant growth, which worked well in the greenhouse. Overall, the study helps farmers understand how much water tomatoes need to grow well in a greenhouse.