36 - 36 Plant Nutrition 36 Plant Nutrition How Do Plants...

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36 Plant Nutrition
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36 Plant Nutrition How Do Plants Acquire Nutrients? What Mineral Nutrients Do Plants Require? What Are the Roles of Soil? Nitrogen fixation
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HUNGER SIGNS!
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36.1 How Do Plants Acquire Nutrients? Nutrients : the major ingredients for macromolecules: carbon, hydrogen, oxygen, nitrogen. Carbon enters the living world from CO 2 in the atmosphere through fixation by photosynthesis. Hydrogen and oxygen enter as water. These three elements are in plentiful supply. Nitrogen is in relatively short supply.
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36.1 How Do Plants Acquire Nutrients? Mineral nutrients required include sulfur for proteins and phosphorus for nucleic acids, etc. Chlorophyll has magnesium, many compounds require iron. In the soil, these and other minerals are dissolved in the soil solution . Plants take up most minerals from the soil solution in ionic form.
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36.1 How Do Plants Acquire Nutrients? Autotrophs : make their own organic molecules from simple inorganic nutrients. Plants, some protists, and some bacteria, are autotrophs. Heterotrophs require pre-formed organic molecules and depend directly or indirectly on autotrophs for food.
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36.1 How Do Plants Acquire Nutrients? Most autotrophs are photosynthesizers; light is the source of energy to synthesize organic compounds. Some are chemolithotrophs , using energy from reduced inorganic compounds such as H 2 S. All are bacteria.
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36.1 How Do Plants Acquire Nutrients? Plants cannot move around to obtain nutrients, but they can extend themselves by growth. As roots grow through the soil, they mine it for new sources of minerals and water. Growth of leaves helps plant obtain more sunlight and CO 2 .
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36.1 How Do Plants Acquire Nutrients? As they grow, plants must deal with variable microenvironments. Microenvironmental conditions can encourage or discourage growth of roots. For example, animal droppings create local high concentrations of nitrogen.
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36.2 What Mineral Nutrients Do Plants Require? Except for nitrogen, all the minerals required by plants are derived from rock. They are all usually taken up from the soil solution. An essential element is one required for the plant to complete its life cycle, and cannot be replaced by another element.
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36.2 What Mineral Nutrients Do Plants Require? Two categories of essential elements: Macronutrients : need at least 1 g per kg of dry plant matter. Micronutrients : need less than 100 mg per kg.
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Table 36.1 Mineral Elements Required by Plants
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36.2 What Mineral Nutrients Do Plants Require? If a plant is deficient in an essential element, it displays characteristic deficiency symptoms . The symptoms help in diagnosis of problems, and appropriate treatment can be applied in the form of fertilizer .
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36.2 What Mineral Nutrients Do Plants Require? Nitrogen deficiency is the most common.
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This note was uploaded on 04/22/2008 for the course BIOLOGY 020.152 taught by Professor Pearlman during the Spring '08 term at Johns Hopkins.

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36 - 36 Plant Nutrition 36 Plant Nutrition How Do Plants...

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