The study looked at how adding biochar to soil affects how much water it can hold and how easily water can move through it. They tested two types of soil with different amounts of biochar and found that adding biochar increased the soil's ability to hold water and reduced how quickly water can flow through it. This is because biochar has special properties that help retain water and change the soil's structure. This suggests that using biochar in soil can help plants grow better and improve overall performance.