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Ch. 37 - Soil and Plant Nutrition
All textbooksCampbell 12th EditionCh. 37 - Soil and Plant NutritionProblem 5
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Chapter 37, Problem 5

. A problem with intensive irrigation is (A) overfertilization. (B) aquifer depletion. (C) the long-term depletion of soil oxygen. (D) the clogging of waterways by vegetation debris.

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Hello everyone here we have a question asking which one of the falling options is not a known issue that occurs as a result of intensive irrigation. A soil salinization, Soil salinization happens because after irrigation the water irrigated to the soil is used by crops or evaporates directly from the wet soil. This leaves behind the salts that is contained in irrigated water and basically the soil is then filled with these salt. So soil salinization does happen as a result of intensive irrigation. Be aqua for depletion, pumping water out of the ground faster than it is replenished for irrigation purposes, results in decreasing aquifer furs. So B does happen as a result of intensive irrigation, sea land subsidence, land subsidence is a gradual settling or sudden sinking of the earth's surface. This happens when there is intensive irrigation, because large amounts of groundwater are removed from certain types of rock. So C does happen as a result of intensive irrigation increased fertility. As we talked about earlier, intensive irrigation causes salinization, which actually decreases the fertility, so it does not increase the fertility it decreases. So our answer here is the increased fertility. Thank you for watching. Bye.
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Textbook Question

Mycorrhizae enhance plant nutrition mainly by a. absorbing water and minerals through the fungal hyphae. b. providing sugar to root cells, which have no chloroplasts. c. converting atmospheric nitrogen to ammonia. d. enabling the roots to parasitize neighboring plants.

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Epiphytes are a. fungi that attack plants. b. fungi that form mutualistic associations with roots. c. nonphotosynthetic parasitic plants. d. plants that grow on other plants.

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Some of the problems associated with intensive irrigation include all of the following except a. soil salinization. b. overfertilization. c. land subsidence. d. aquifer depletion.

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Textbook Question

A mineral deficiency is likely to affect older leaves more than younger leaves if a. the mineral is a micronutrient. b. the mineral is very mobile within the plant. c. the mineral is required for chlorophyll synthesis. d. the mineral is a macronutrient.

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Textbook Question

The greatest difference in health between two groups of plants of the same species, one group with mycorrhizae and one group without mycorrhizae, would be in an environment a. where nitrogen-fixing bacteria are abundant. b. that has soil with poor drainage. c. that has hot summers and cold winters. d. in which the soil is relatively deficient in mineral nutrients.

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Textbook Question

Two groups of tomatoes were grown under laboratory conditions, one with humus added to the soil and one a control without humus. The leaves of the plants grown without humus were yellowish (less green) compared with those of the plants grown in humus-enriched soil. The best explanation is that a. the healthy plants used the food in the decomposing leaves of the humus for energy to make chlorophyll. b. the humus made the soil more loosely packed, so water penetrated more easily to the roots. c. the humus contained minerals such as magnesium and iron needed for the synthesis of chlorophyll. d. the heat released by the decomposing leaves of the humus caused more rapid growth and chlorophyll synthesis.

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