Field Capacity Tension Range: In salt-free agricultural soils, soil moisture tension at field capacity varies directly with soil texture:
Coarse sandy soils release gravitational water rapidly, reaching field capacity at tensions as low as .04$ to .10\text{ atmosphere}$ (/10\text{ bar}$). - Medium to fine textured soils (loams, silt loams, and clays) retain capillary water more tenaciously against gravity, stabilizing at .33\text{ atmosphere}$ (/3\text{ bar}$) up to approximately .7\text{ atmosphere}$. - Conclusion: The overall textured-dependent field capacity tension ranges from .04$ to .7\text{ atmosphere}$. (Correct answer: Option 3)
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
7
ICAR JRF Soil Science 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Surangam, water harvesting structures are found in
Surangam Water Harvesting: Surangam (also spelled Thurangam) is a traditional indigenous cave-well horizontal excavation system carved into hard lateritic hill slopes of Kasaragod district, Kerala (and adjoining border regions of South Canara, Karnataka).
Function: Taps groundwater tables by natural gravity flow without requiring mechanical pumping energy. (Correct answer: Option 3)
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
8
ICAR JRF Soil Science 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Which of the following is a traditional rainwater harvesting technique practiced in rainfed agriculture?
Contour Bunding: An established in-situ soil and moisture conservation practice in rainfed agricultural watersheds where earthen embankments (bunds) are constructed across the slope along contour lines.
Function: Impounds surface runoff water behind the bunds, slows runoff velocity, and enhances deep rainwater infiltration into the soil profile.
Comparison: Drip and sprinkler are pressurized modern micro-irrigation systems; desalination is an industrial seawater treatment process. (Correct answer: Option 3)
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
9
ICAR JRF Soil Science 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Which of the following irrigation scheduling methods relies on soil moisture measurements to determine when irrigation is
needed?
Soil Moisture Sensors: Direct sensing instruments (such as gypsum electrical resistance blocks, tensiometers, Time Domain Reflectometry (TDR), and capacitance probes) installed at effective crop root depths to monitor soil water tension or volumetric water content.
Comparison: Calendar-based scheduling uses fixed time intervals regardless of soil moisture; pan evaporation and Crop Water Stress Index (CWSI) rely on atmospheric evaporative demand or canopy infrared temperature. (Correct answer: Option 4)
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
10
ICAR JRF Soil Science 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Which factor is NOT a consideration in groundwater management?
Direct Groundwater Management Parameters: Aquifer budgeting and sustainable yield estimation depend strictly on:
Rate of natural/artificial groundwater recharge ($BCM/year$)
Total extraction rate via tube-wells ($BCM/year$)
Depth to water table and piezometric fluctuation ($m$)
Surface Water Availability: Represents an external component of surface hydrology and conjunctive water use rather than a direct internal parameter of subsurface aquifer water table balance. (Correct answer: Option 4)
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report
Report Issue / Suggest Correctionत्रुटि रिपोर्ट / संशोधन सुझाव
No official replies published yet for this questionइस प्रश्न पर अभी कोई आधिकारिक समाधान प्रकाशित नहीं है
Have an objection, typo, or doubt? Submit a report in Tab 1. Our subject experts will audit the question and publish the official resolution here.यदि आपको इस प्रश्न या उत्तर कुंजी में कोई आपत्ति है, तो 'त्रुटि रिपोर्ट' टैब से विवरण भेजें। हमारी विषय विशेषज्ञ टीम समीक्षा कर आधिकारिक समाधान प्रकाशित करेगी।