The study looked at how much water young Jatropha plants need when grown with drip irrigation. They used special containers to measure the water used by the plants and calculated a number called the crop coefficient. This number helps farmers know how much water to give the plants at different stages of growth. The researchers found that the plants needed more water as they grew, with different water needs during the initial, development, mid-season, and late stages. This information can help farmers grow Jatropha plants more efficiently and increase their crop yield.