In general plants extract water from the soil in the following pattern-40% of their requirement from the first quarter (top-most layer) of root zone, 30% from the second quarter, 20% from the third quarter and 10% from the fourth quarter (bottom-most layer) of their effective root zone depth, since a greater part of the roots (60-75%) lie in the top [...]
In this article we will discuss about the soil moisture characteristic curves. Soil moisture tension does indicate neither the moisture content of soil nor the amount of moisture that can be withdrawn for plant use at any particular tension. Knowledge of the amount of moisture a given soil holds at various tensions is necessary to know the amount of water [...]
After reading this article you will learn about:- 1. Soil Moisture Constants 2. Measurement of Soil Moisture 3. Loss. Soil Moisture Constants: (i) Field capacity is the amount of moisture held by the soil after the excess gravitational water has drained away. Negative potential or free energy of soil water is 0.1 to 0.3 bars. Approximate of value is 2.54. [...]