The moisture holding capacity if a certain sol is \( 150 \mathrm{~m} / \mathrm{m} \)-deth. frrication is to stast from \( 55 \% \) moisture holding capacity with a peat rate for a mosture of \( 1 \mathrm{~mm} / \mathrm{d} \) lt a cop with a 0.6 m rootzone deth is to be grown, determine; i) Depth of irrigation water. ii) Irrigation interval.

To determine the depth of irrigation water and the irrigation interval, we can follow these steps: ### Given Data: - Moisture holding capacity of the soil = \( 150 \, \text{mm/m} \) - Starting moisture level = \( 55\% \) of moisture holding capacity - Peat rate for moisture = \( 1 \, \text{mm/d} \) - Root zone depth = \( 0.6 \, \text{m} \) ### Step 1: Calculate the total moisture holding capacity for the root zone. \[ \text{Total moisture holding capacity} = \text{Moisture holding capacity} \times \text{Root zone depth} \] \[ \text{Total moisture holding capacity} = 150 \, \text{mm/m} \times 0.6 \, \text{m} = 90 \, \text{mm} \] ### Step 2: Calculate the starting moisture content. \[ \text{Starting moisture content} = 55\% \times \text{Total moisture holding capacity} \] \[ \text{Starting moisture content} = 0.55 \times 90 \, \text{mm} = 49.5 \, \text{mm} \] ### Step 3: Calculate the depth of irrigation water needed to reach field capacity. To find the depth of irrigation water needed, we need to determine how much moisture is required to bring the soil back to field capacity (which is the total moisture holding capacity). \[ \text{Depth of irrigation water} = \text{Total moisture holding capacity} - \text{Starting moisture content} \] \[ \text{Depth of irrigation water} = 90 \, \text{mm} - 49.5 \, \text{mm} = 40.5 \, \text{mm} \] ### Step 4: Calculate the irrigation interval. The irrigation interval can be calculated based on the peat rate for moisture loss and the depth of irrigation water. \[ \text{Irrigation interval} = \frac{\text{Depth of irrigation water}}{\text{Peat rate for moisture}} \] \[ \text{Irrigation interval} = \frac{40.5 \, \text{mm}}{1 \, \text{mm/d}} = 40.5 \, \text{days} \] ### Summary of Results: i) Depth of irrigation water: **40.5 mm** ii) Irrigation interval: **40.5 days**