Soil and Plant Nutrition Flashcards

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1
Q

“A” soil horizon

A

nutrient-rich topsoil that is high in organic matter

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2
Q

“B” and “C” soil horizons

A

nutrient poor soil layers composed of broken down rock

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3
Q

Soil leaching

A

anions such as NO3- and H2PO4- migrate to lower soil levels because of the soil particles negative surface charge

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4
Q

Cation exchange

A

plants respirate CO2 which joins with H2O to form H2CO3, which lowers the ph of soil and allows the cations to break away from the negative surface charge of soil particles and become soil solution

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5
Q

Best soil particles for cation exchange

A

clay is most suitable for cation exchange because its small surface area ensures other substances don’t disrupt cation exchange

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6
Q

Phytoremediation

A

cultivation of plants that remove contaminates from the soil

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7
Q

Macronutrients

A

elements that are required in high quantities for the plant physical structure

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8
Q

Micronutrients

A

elments that are required in low quantities that serve as cofactors in enzymatic reactions

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9
Q

Poor irrigation leads to

A

land subsidence (collapse from removal of ground water) and soil salinization (soil with a high salt content)

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10
Q

Ectomycorrhizae

A

form a sheath over the roots surface and grow in the apoplast

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11
Q

Apoplast

A

cell walls and spaces between cell walls, everything but the cell interior

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