Which term describes the deficit of soil moisture relative to field capacity?

Which term describes the deficit of soil moisture relative to field capacity?

• A. Field capacity
• B. Wilting point
• C. Soil moisture deficit
• D. Soil moisture recharge

Answer: (C)

Think of field capacity as the soil’s maximum moisture level after drainage, the amount of water plants can effectively use. The deficit relative to field capacity is the amount of water that is missing to bring the soil up to that full-capacity level. In other words, soil moisture deficit equals field capacity minus the current soil moisture content. This tells you how much irrigation would be needed to restore the soil to its field-capacity condition, which is a key measure for scheduling irrigation and assessing water stress. The wilting point, by contrast, is a lower moisture threshold at which plants wilt and cannot recover quickly; it’s not a measure of how far you are from field capacity. Soil moisture recharge describes the process of moisture increasing after a dry period, not the current shortfall.

Think of field capacity as the soil’s maximum moisture level after drainage, the amount of water plants can effectively use. The deficit relative to field capacity is the amount of water that is missing to bring the soil up to that full-capacity level. In other words, soil moisture deficit equals field capacity minus the current soil moisture content. This tells you how much irrigation would be needed to restore the soil to its field-capacity condition, which is a key measure for scheduling irrigation and assessing water stress. The wilting point, by contrast, is a lower moisture threshold at which plants wilt and cannot recover quickly; it’s not a measure of how far you are from field capacity. Soil moisture recharge describes the process of moisture increasing after a dry period, not the current shortfall.