What do you mean by hygroscopic water and combined water in the soil ? Are these available to plants?

Explanation

Some water in the soil forms an extremely thin, tightly held film around the soil particles. It is called hydroscopic water. In the soil, a small protion of soil water is chemically bound with soil materials. Is is called combined water. In the soil, a small protion of soil water is chemically bound with soil meterials. It is called combined water. Both these type of water in the soil are not available to plants by their roots.