The researchers studied how different amounts of nitrogen and water availability affect the growth and photosynthesis of barley plants. They looked at factors like leaf growth, chlorophyll content, and photosynthetic activity. By measuring parameters like dry weight, chlorophyll levels, and water content in the leaves, they found that nitrogen supply and water stress can impact the plant's ability to balance photochemical and non-photochemical processes. This information can help us understand how plants respond to stress and how we can optimize their growth in challenging conditions.