Chapter 37 - Soil and Plant Nutrition (copy)

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mineral particles

Weathering causes ________ to combine with living organisms and humus.

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3

agriculture

In ________, legume crops are cycled with other crops to replenish soil nitrogen.

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4

Mycorrhizae

________ are mutualistic fungi- root connections.

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5

Plant roots

________ take nutrients from the earth.

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absorb water

Mycorrhizae's fungal hyphae ________ and minerals, which they then pass on to their plant hosts.

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Topsoil

________ is a diverse environment teeming with bacteria, fungus, protists, animals, and plant roots.

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Plants

________ are fed by the soil solution, which is made up of water and dissolved minerals in the pores between soil particles.

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atmospheric N2

Nitrogen- fixing bacteria convert ________ to nitrogenous minerals, which plants can use as a nitrogen source in organic synthesis.

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10

Mechanical fracture

________ is caused by water freezing in rock fissures, and chemical fracturing is caused by weak acids in the soil.

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11

Rhizobacteria

________ get their energy from the rhizosphere, a microorganism- rich ecosystem that is tightly linked to roots.

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Plants

________ get the majority of their nitrogen via bacterial breakdown of humus and gaseous nitrogen- fixing.

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