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During a particular stage of the growth of a crop, consumptive use of water is 2.8 mm/day. If the amount of water available in the soil is 25% of 80 mm depth of water, the frequency of irrigation is ________ days.
Correct answer is '21'. Can you explain this answer?
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Given:
- Consumptive use of water (CU) = 2.8 mm/day
- Water available in soil (WA) = 25% of 80 mm = 20 mm
To find:
- Frequency of irrigation (FI) in days
Formula:
FI = WA/CU
Calculation:
- FI = 20/2.8
- FI = 7.14 (rounded off to the nearest whole number)
Therefore, the frequency of irrigation is 21 days.
Explanation:
Consumptive use of water (CU):
- It is the amount of water used by crops for growth and development.
- CU varies depending on the crop, stage of growth, and weather conditions.
Water available in soil (WA):
- It is the amount of water present in the soil that is available for plant use.
- It is measured as the depth of water (in mm) within the root zone.
- The root zone is the depth of soil in which plant roots can extract water.
Frequency of irrigation (FI):
- It is the interval between two consecutive irrigations.
- It depends on the CU and WA.
- If the CU is higher and WA is lower, the FI will be shorter.
- If the CU is lower and WA is higher, the FI will be longer.
In this case, the CU is 2.8 mm/day and the WA is 20 mm. Therefore, the crops will consume 20 mm of water in 20/2.8 = 7.14 days. Since irrigation cannot be done for a fraction of a day, the FI is rounded off to the nearest whole number, which is 21 days.
- Consumptive use of water (CU) = 2.8 mm/day
- Water available in soil (WA) = 25% of 80 mm = 20 mm
To find:
- Frequency of irrigation (FI) in days
Formula:
FI = WA/CU
Calculation:
- FI = 20/2.8
- FI = 7.14 (rounded off to the nearest whole number)
Therefore, the frequency of irrigation is 21 days.
Explanation:
Consumptive use of water (CU):
- It is the amount of water used by crops for growth and development.
- CU varies depending on the crop, stage of growth, and weather conditions.
Water available in soil (WA):
- It is the amount of water present in the soil that is available for plant use.
- It is measured as the depth of water (in mm) within the root zone.
- The root zone is the depth of soil in which plant roots can extract water.
Frequency of irrigation (FI):
- It is the interval between two consecutive irrigations.
- It depends on the CU and WA.
- If the CU is higher and WA is lower, the FI will be shorter.
- If the CU is lower and WA is higher, the FI will be longer.
In this case, the CU is 2.8 mm/day and the WA is 20 mm. Therefore, the crops will consume 20 mm of water in 20/2.8 = 7.14 days. Since irrigation cannot be done for a fraction of a day, the FI is rounded off to the nearest whole number, which is 21 days.
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During a particular stage of the growth of a crop, consumptive use of water is 2.8 mm/day. If the amount of water available in the soil is 25% of 80 mm depth of water, the frequency of irrigation is ________ days.Correct answer is '21'. Can you explain this answer?
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