Term
| Red or brown soil color indicates _____ aeration. |
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Definition
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Term
| Soil mineral horizons containing accumulation of organic matter are usually _____ in color. |
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Definition
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| Silt particles have equivalent spherical diameters _______ |
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Definition
| between 0.002 mm and 0.05 mm |
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Term
| Sand particles settle ______ clay particles in water |
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Definition
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Term
| The shrink-swell potential of sand particles is usually very... |
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Definition
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Term
| Soil structure ____ influence soil aeration. |
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Definition
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Term
| Block-like structure is common in the B horizons of ____ climate soils. |
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Definition
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Term
| In well aerated souls, the soil air is mostly... |
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Definition
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Term
| Mass flow occurs when gas molecules move down a ______ gradient. |
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Definition
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Term
| Tillage changes a soil's _____ density |
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Definition
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Term
| An acre furrow slice contains about ____ pounds of soil. |
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Definition
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Term
| The area drained by a river is its ______ |
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Definition
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Term
| For a well to have water in it, it must penetrate the zone of ______ |
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Definition
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Term
| To have a flowing artesian well, the recharge area of the aquifer must be _____ than the top of the well. |
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Definition
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Term
| Most of the minerals in continental crust are ______ |
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Definition
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Term
| In the clay minerals, isomorphous substitution results in a net ______ charge on the mineral. |
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Definition
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Term
| ________ are high shrink-swell clays. |
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Definition
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Term
| In Alabama soils, the charge on the sesquioxides ________ with the pH of the soil. |
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Definition
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Term
| Soils in high rainfall tend to be _______. |
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Definition
| acid and low in fertility |
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Term
| Most of the acid found in mineral is a form of _______ |
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Definition
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Term
| To be a plant, an organism must be photosynthetic. (true of false) |
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Definition
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Term
| Over the past several years the carbon dioxide level in the Earth's atmosphere has been _______. |
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Definition
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Term
| In nothing else is limiting, increasing the level of carbon dioxide in the air should _______ the rate of photosynthesis by organisms. |
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Definition
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Term
| Nitrification ______ the soil pH. |
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Definition
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Term
| Inf an organic material high in nitrogen ((C/N)<20) is added to a soil, nitrogen will be _______. |
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Definition
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Term
| The soil air is higher in _______ than the atmosphere. |
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Definition
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Term
| Mass flow of the soil air is ______ than diffusion. |
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Definition
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Term
| The soil's water content affects its aeration. (true/false) |
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Definition
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Term
| ______ soils have the most large pores |
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Definition
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Term
| A soil's bulk density is always _______ particle density. |
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Definition
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Term
| A ________ is the boundary between two watersheds. |
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Definition
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Term
| The Darcy's Law conductivity of a soil depends on its water content. (t/f) |
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Definition
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Term
| If it can, water will flow down. (t/f) |
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Definition
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Term
| Unless the soil is saturated, the soil water will tend to flow from smaller to larger pores. (t/f) |
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Definition
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Term
| At the soil's wilting point, the relative humidity of the soil's air is less than 20%. (T/F) |
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Definition
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Term
| ______ clays have a very high shrink-swell potential. |
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Definition
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Term
| Very highly weathers soils tend to have large amounts of ______ |
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Definition
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Term
| If the organic matter decaying in the soil has a C to N ration greater than 20, soil N will be ________. |
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Definition
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Term
| The carbon cycle is powered by _____ |
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Definition
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Term
| Isomorphus substitution in clay minerals results in a ______ charge. |
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Definition
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