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LAST QUIZ - accumulate in the soil 7 T In saline soils...

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LAST QUIZ 1. H ions that cause soil acidity come from 1. Carbonic acid formed in soil and in rain 2. Organic acids from microbial breakdown of OM 3. Oxidation of ammonium (nitrification) 4. All of the above 2. T Al toxicity is the most common and severe problem for plants and microorganisms in soil with pH 5 and below 3. F Plant nutrients are most available between pH 6.5 and 7.5 4. Two anions added in liming materials to consume H ions are CO 3 - and OH - , SiO 3 2- 5. T Soils with a higher buffer capacity require more lime to change the pH 6. F Under natural conditions, when the precipitation-to-ET ratio is 2.75 or more, salts will
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Unformatted text preview: accumulate in the soil 7. T In saline soils, plant growth restrained by problems with water uptake 8. F In sodic soils, the dominant cation is Ca 9. T In order to reclaim salt-affected soil it is critical to establish internal drainage if possible 10. Mechanisms of salt tolerance in plants include 1. Exclusion of salt ions from uptake by plant root cells (wheat, barley, rye) 2. Excretion of absorbed salts from plant by means of salt glands 3. Isolation of salts in cell vacuoles 4. All of the above...
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