Week 6 soils

Does dry soil have a higher 📈 or lower 📉 initial infiltration rate than moist soil? 🏜⚖

Higher initial infiltration rate! 📈⚡▫🌱

Why does dry soil have a much higher initial infiltration rate than wet soil? 🏜🧲

High matric suction pulls water in from all directions, adding to the downward pull of gravity! 🧲⬇ ▫ 🌱

Over the course of a prolonged rainstorm, does the infiltration rate increase ⬆, decrease ⬇, or stay constant 🔒? 🌧📉

Decreases steadily until reaching a constant steady-state rate! 📉🐢 ▫ 🌱

Why does the infiltration rate level off to a constant value during sustained rainfall? 🌊⚖️

Pore spaces become fully saturated, leaving only gravity to pull water down at saturated hydraulic conductivity! 🌊⚖️ ▫️ 🌱

Does coarse sand 🏖️ or aggregated clay 🧱 have a higher final steady-state infiltration rate? 🏖️⚖️

Coarse sand has a much higher infiltration rate! 🏖️⚡ ▫️ 🌱

Why does coarse sand exhibit a much higher infiltration capacity than unaggregated clay? 🕳️🐢

Wide macropores allow rapid gravitational flow, whereas tiny clay micropores create high frictional drag! 🕳️🐢 ▫️ 🌱

Does the formation of a physical surface crust increase ⬆️ or decrease ⬇️ infiltration rate? 🌧️🛑

Decreases infiltration rate sharply! 📉🛑 ▫️ 🌱

Why does raindrop impact create a surface crust that restricts infiltration? 🌧️💥

Kinetic energy of raindrops shatters surface peds, washing fine clay platelets into pore necks to plug them shut! 🌧️💥 ▫️ 🌱

Does maintaining surface crop residue increase ⬆️ or decrease ⬇️ profile water storage? 🌾📈

Increases profile water storage! 📈🌾 ▫️ 🌱

Why does surface residue management enhance soil moisture storage? 🛡️☀️

Residue absorbs raindrop kinetic energy to stop crusting, shades soil to cut evaporation, and protects open biopores! 🛡️☀️ ▫️ 🌱

Does continuous no-till farming increase ⬆️ or decrease ⬇️ the number of continuous vertical biopores? 🪱📈

Increases continuous vertical biopores! ⬆️🪱 ▫️ 🌱

Why do intact biopores under conservation tillage dramatically accelerate water infiltration? 🪱⚡

Undisturbed earthworm channels and root voids act as open expressways for rapid preferential water flow! 🪱⚡ ▫️ 🌱

Is surface ditch drainage 🚜 or subsurface tile drainage 🕳️ more effective at lowering a high water table within the root zone? 🕳️🌾

Subsurface tile drainage is far more effective! 🕳️🌾 ▫️ 🌱

Why does subsurface tile drainage improve root growth in waterlogged soils? 🫁🌱

Lowering the water table replaces suffocating pore water with fresh air, expanding aerated rooting depth! 🫁🌱 ▫️ 🌱

Does surface drainage carry a higher 📈 or lower 📉 risk of soil erosion and surface sediment loss than subsurface tile drainage? 🚜🌊

Higher risk of erosion and sediment loss! 📈🌊 ▫️ 🌱

What is the primary environmental water quality trade-off associated with subsurface tile drainage? 🧪🐟

Leaches high concentrations of soluble nitrate (NO₃⁻) directly into receiving waterways! 🧪🐟 ▫️ 🌱

Why does dry soil have a much higher initial infiltration rate than wet soil? 🏜️🧲

High matric suction pulls water in from all directions, adding to the downward pull of gravity! 🧲⬇️ ▫️ 🌱

Over the course of a prolonged rainstorm, does the infiltration rate increase ⬆️, decrease ⬇️, or stay constant 🔒? 🌧️📉

Decreases steadily until reaching a constant steady-state rate! 📉🐢 ▫️ 🌱

Why does the infiltration rate level off to a constant value during sustained rainfall? 🌊⚖️

Pore spaces become fully saturated, leaving only gravity to pull water down at saturated hydraulic conductivity! 🌊⚖️ ▫️ 🌱

Does coarse sand 🏖️ or aggregated clay 🧱 have a higher final steady-state infiltration rate? 🏖️⚖️

Coarse sand has a much higher infiltration rate! 🏖️⚡ ▫️ 🌱

Why does coarse sand exhibit a much higher infiltration capacity than unaggregated clay? 🕳️🐢

Wide macropores allow rapid gravitational flow, whereas tiny clay micropores create high frictional drag! 🕳️🐢 ▫️ 🌱

Does the formation of a physical surface crust increase ⬆️ or decrease ⬇️ infiltration rate? 🌧️🛑

Decreases infiltration rate sharply! 📉🛑 ▫️ 🌱

Why does raindrop impact create a surface crust that restricts infiltration? 🌧️💥

Kinetic energy of raindrops shatters surface peds, washing fine clay platelets into pore necks to plug them shut! 🌧️💥 ▫️ 🌱

Does high soil organic matter (SOM) cause the infiltration rate to increase ⬆️ or decrease ⬇️? 🍂📈

Increases the infiltration rate! 📈🍂 ▫️ 🌱

Why does adding organic matter increase the rate of water infiltration into soil? 🧽🍪

Humic glues build durable crumb aggregates that resist slaking and maintain large, open drainage pores! 🍪🕳️ ▫️ 🌱

Does maintaining surface crop residue increase ⬆️ or decrease ⬇️ profile water storage? 🌾📈

Increases profile water storage! 📈🌾 ▫️ 🌱

Why does surface residue management enhance soil moisture storage? 🛡️☀️

Residue absorbs raindrop kinetic energy to stop crusting, shades soil to cut evaporation, and protects open biopores! 🛡️☀️ ▫️ 🌱

Does planting winter cover crops increase ⬆️ or decrease ⬇️ infiltration compared to leaving fields in bare fallow? 🌿📈

Increases water infiltration! 📈🌿 ▫️ 🌱

Why do cover crops improve water intake into the soil profile compared to bare fallow? 🌱🛡️

Root channels leave open drainage pipes, root exudates stabilize peds, and foliage shields against crusting! 🌿🕳️ ▫️ 🌱

Does continuous no-till farming increase ⬆️ or decrease ⬇️ the number of continuous vertical biopores? 🪱📈

Increases continuous vertical biopores! ⬆️🪱 ▫️ 🌱

Why do intact biopores under conservation tillage dramatically accelerate water infiltration? 🪱⚡

Undisturbed earthworm channels and root voids act as open expressways for rapid preferential water flow! 🪱⚡ ▫️ 🌱

Is surface ditch drainage 🚜 or subsurface tile drainage 🕳️ more effective at lowering a high water table within the root zone? 🕳️🌾

Subsurface tile drainage is far more effective! 🕳️🌾 ▫️ 🌱

Does surface drainage carry a higher 📈 or lower 📉 risk of soil erosion and surface sediment loss than subsurface tile drainage? 🚜🌊

Higher risk of erosion and sediment loss! 📈🌊 ▫️ 🌱

Why does surface ditch drainage cause higher topsoil erosion than subsurface tile drainage? 🌊🚜

Overland water gains velocity across the ground surface, detaching and scouring loose topsoil particles! 🌊🏃 ▫️ 🌱

Does subsurface tile drainage increase ⬆️ or decrease ⬇️ the export of soluble nitrate (NO₃⁻) to surface waterways? 🧪📈

Increases soluble nitrate export! 📈🧪 ▫️ 🌱

Why does subsurface tile drainage accelerate nitrate leaching compared to surface runoff? 🧲🌊

Nitrate is a dissolved negative ion repelled by negative clay, so percolating water flushes it directly into tile pipes! 🧲🚿 ▫️ 🌱

Does measuring river discharge in cubic feet per second track water quality 🧪 or water quantity 🌊? 🌊⚖️

Measures water quantity! 🌊📊 ▫️ 🌱

What is the fundamental difference between water quality and water quantity? 🧪🌊

Water quantity measures the volume of water available; water quality measures how clean or polluted that water is! 📊🐟 ▫️ 🌱