B.Sc. Agriculture Sem. - I | Soil Science | SSAC-111, Fundamental of Soil Science #royalinstitute
Royal B.Sc. Agriculture Classes English Medium・2 minutes read
Soil water is classified into Gravitational Water and Capillary Water, with Capillary Water found in micro pores and capillary tubes. Field Capacity, Permanent Wilting Point, and Hygroscopic Capacity are essential concepts related to soil water content, essential for plant growth and agriculture.
Insights
- Capillary Water in soil is located in Capillary Tubes and Micro Pores, offering plants a source of water at a potential of -0.33 m 31 bar, crucial for their growth and sustenance.
- Understanding the concepts of Field Capacity and Permanent Wilting Point is essential for assessing soil water availability for plants, with Field Capacity providing 100% of water accessible to plants and Permanent Wilting Point marking the limit where plants can no longer absorb water, crucial for effective agricultural practices.
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Recent questions
What are the different classifications of soil water?
Gravitational Water, Capillary Water, Hygroscopic Water
What is Field Capacity in soil water dynamics?
Soil's ability to hold water against gravitational force
What is the significance of Permanent Wilting Point in plant growth?
Plants can no longer absorb water and wilt
How are PF values utilized in soil water analysis?
Crucial for determining different water capacities
What are the common methods for measuring soil water content?
Direct method and Gravimetric Method
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Summary
00:00
Soil Water: Types and Capacities Explained
- Soil water has different classifications, including Gravitational Water and Capillary Water.
- Capillary Water is found in Capillary Tubes and Micro Pores of Soil.
- Capillary Water is available at a potential of -0.33 m 31 bar inside micro pores.
- Hygroscopic Water is tightly absorbed by soil particles from the atmosphere.
- Field Capacity is the soil's ability to hold water against gravitational force.
- Field Capacity is reached 2-3 days after saturating the soil with water.
- At Field Capacity, 100% of water is available for plants.
- Permanent Wilting Point is where plants can no longer absorb water and wilt.
- Permanent Wilting Point occurs at -15 bar, while Ultimate Wilting Point is at -60 bar.
- PF values for different water capacities are crucial: Field Capacity (2.58), Permanent Wilting Point (4.18), and Hygroscopic Capacity (4.5).
22:00
Soil water measurement methods and exam prep
- One atmosphere bar equals 1023 centimeters of water column, representing equal pressures.
- Soil water measurement methods include the direct method, where water content is directly asked and the Gravimetric Method, calculating water mass by weighing wet and dry soil.
- To determine soil water content percentage, weigh wet soil, dry it, weigh it again, and calculate the difference as the water weight percentage.
- Upcoming CT and JET exam preparation batches start on October 1, 2024, in both online and offline modes, catering to students aiming for ICR PG or JRF SRF exams.
