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Crops are grown in a field having soil, which has field capacity of 30% and permanent wilting point of 13%. The effective depth of root zone is 80 cm. Irrigation water is supplied when the average soil moisture drops to 20%. Consider density of the soil as 1500 kg/m3 and density of water as 1000 kg/m3. If the daily consumptive use of water for the crops is 2 mm, the frequency of irrigating the crops (in days), is
- a)7
- b)13
- c)10
- d)None of these
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Crops are grown in a field having soil, which has field capacity of 30...
FC = 30%
PWP = 13%
= 12 cm or 120 mm
Consumptive use = 2 mm/day
So, frequency of irrigation = 120/2 = 60 days
PWP = 13%
= 12 cm or 120 mm
Consumptive use = 2 mm/day
So, frequency of irrigation = 120/2 = 60 days
Most Upvoted Answer
Crops are grown in a field having soil, which has field capacity of 30...
Given information:
- Field capacity = 30%
- Permanent wilting point = 13%
- Effective depth of root zone = 80 cm
- Density of soil = 1500 kg/m3
- Density of water = 1000 kg/m3
- Daily consumptive use of water for the crops = 2 mm
Calculations:
1. Available water content:
- Available water content = Field capacity - Permanent wilting point
- Available water content = 30% - 13%
- Available water content = 17%
2. Water holding capacity:
- Water holding capacity = Available water content x Effective depth of root zone
- Water holding capacity = 17% x 80 cm
- Water holding capacity = 13.6 cm
3. Irrigation threshold:
- Irrigation threshold = Water holding capacity x (100% - 20%)
- Irrigation threshold = 13.6 cm x 80%
- Irrigation threshold = 10.88 cm
4. Volume of water required for irrigation:
- Volume of water required = Irrigation threshold x Area of field
- Area of field = 1 hectare = 10,000 m2
- Volume of water required = 10.88 cm x 10,000 m2
- Volume of water required = 1088 m3
5. Time period between irrigations:
- Time period = Volume of water required / Daily consumptive use of water
- Time period = 1088 m3 / (2 mm x 10,000 m2)
- Time period = 54.4 days
Answer:
The frequency of irrigating the crops is not one of the given options, so the correct answer is option 'D' (None of these). The time period between irrigations is approximately 54.4 days.
- Field capacity = 30%
- Permanent wilting point = 13%
- Effective depth of root zone = 80 cm
- Density of soil = 1500 kg/m3
- Density of water = 1000 kg/m3
- Daily consumptive use of water for the crops = 2 mm
Calculations:
1. Available water content:
- Available water content = Field capacity - Permanent wilting point
- Available water content = 30% - 13%
- Available water content = 17%
2. Water holding capacity:
- Water holding capacity = Available water content x Effective depth of root zone
- Water holding capacity = 17% x 80 cm
- Water holding capacity = 13.6 cm
3. Irrigation threshold:
- Irrigation threshold = Water holding capacity x (100% - 20%)
- Irrigation threshold = 13.6 cm x 80%
- Irrigation threshold = 10.88 cm
4. Volume of water required for irrigation:
- Volume of water required = Irrigation threshold x Area of field
- Area of field = 1 hectare = 10,000 m2
- Volume of water required = 10.88 cm x 10,000 m2
- Volume of water required = 1088 m3
5. Time period between irrigations:
- Time period = Volume of water required / Daily consumptive use of water
- Time period = 1088 m3 / (2 mm x 10,000 m2)
- Time period = 54.4 days
Answer:
The frequency of irrigating the crops is not one of the given options, so the correct answer is option 'D' (None of these). The time period between irrigations is approximately 54.4 days.
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Crops are grown in a field having soil, which has field capacity of 30% and permanent wilting point of 13%. The effective depth of root zone is 80 cm. Irrigation water is supplied when the average soil moisture drops to 20%. Consider density of the soil as 1500 kg/m3 and density of water as 1000 kg/m3. If the daily consumptive use of water for the crops is 2 mm, the frequency of irrigating the crops (in days), isa)7b)13c)10d)None of theseCorrect answer is option 'D'. Can you explain this answer?
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Crops are grown in a field having soil, which has field capacity of 30% and permanent wilting point of 13%. The effective depth of root zone is 80 cm. Irrigation water is supplied when the average soil moisture drops to 20%. Consider density of the soil as 1500 kg/m3 and density of water as 1000 kg/m3. If the daily consumptive use of water for the crops is 2 mm, the frequency of irrigating the crops (in days), isa)7b)13c)10d)None of theseCorrect answer is option 'D'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about Crops are grown in a field having soil, which has field capacity of 30% and permanent wilting point of 13%. The effective depth of root zone is 80 cm. Irrigation water is supplied when the average soil moisture drops to 20%. Consider density of the soil as 1500 kg/m3 and density of water as 1000 kg/m3. If the daily consumptive use of water for the crops is 2 mm, the frequency of irrigating the crops (in days), isa)7b)13c)10d)None of theseCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Crops are grown in a field having soil, which has field capacity of 30% and permanent wilting point of 13%. The effective depth of root zone is 80 cm. Irrigation water is supplied when the average soil moisture drops to 20%. Consider density of the soil as 1500 kg/m3 and density of water as 1000 kg/m3. If the daily consumptive use of water for the crops is 2 mm, the frequency of irrigating the crops (in days), isa)7b)13c)10d)None of theseCorrect answer is option 'D'. Can you explain this answer?.
Crops are grown in a field having soil, which has field capacity of 30% and permanent wilting point of 13%. The effective depth of root zone is 80 cm. Irrigation water is supplied when the average soil moisture drops to 20%. Consider density of the soil as 1500 kg/m3 and density of water as 1000 kg/m3. If the daily consumptive use of water for the crops is 2 mm, the frequency of irrigating the crops (in days), isa)7b)13c)10d)None of theseCorrect answer is option 'D'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about Crops are grown in a field having soil, which has field capacity of 30% and permanent wilting point of 13%. The effective depth of root zone is 80 cm. Irrigation water is supplied when the average soil moisture drops to 20%. Consider density of the soil as 1500 kg/m3 and density of water as 1000 kg/m3. If the daily consumptive use of water for the crops is 2 mm, the frequency of irrigating the crops (in days), isa)7b)13c)10d)None of theseCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Crops are grown in a field having soil, which has field capacity of 30% and permanent wilting point of 13%. The effective depth of root zone is 80 cm. Irrigation water is supplied when the average soil moisture drops to 20%. Consider density of the soil as 1500 kg/m3 and density of water as 1000 kg/m3. If the daily consumptive use of water for the crops is 2 mm, the frequency of irrigating the crops (in days), isa)7b)13c)10d)None of theseCorrect answer is option 'D'. Can you explain this answer?.
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