Campbell, Reece's Biology: Nasta Edition (PART 2 of 2) PDF

By Campbell, Reece

Biology: Nasta variation [Hardcover]

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Extra resources for Biology: Nasta Edition (PART 2 of 2)

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785-789) ... Soil Texture Particles of various sizes derived from the breakdown of rock are found in soil. Soil particle size affects the availability of water, oxygen, and minerals in the soil. Topsoil Composition A soil's composition refers to its inor- ganic and organic components. Topsoil is a complex ecosystem teeming with bacteria, fungi, protists, animals, and the roots of plants. Soil Conservation and Sustainable Agriculture Some agricultural practices can deplete the mineral content of soil, tax water reserves, and promote erosion.

For suggested answers, see Appendix A. 8). When leaves of these smart plants develop a blue tinge, the farmer knows it is time to add phosphate-containing fertilizer. So far, you have learned that soil, to support vigorous plant growth, must have an adequate supply ofmineral nutrients, sufficient aeration, good water-holding capacity, low salinity, and a pH near neutrality. It must also be free of toxic concentrations of minerals and other chemicals. These physical and chemical features of soil, however, are just half the story.

Micronutrients, elements required in very small amounts, typically have catalytic functions as cofactors of enzymes. Symptoms of Mineral Deficiency Deficiency of a mobile nutrient usually affects older organs more than younger ones; the reverse is true for nutrients that are less mobile within a plant. Macronutrient deficiencies are most common, particularly deficiencies of nitrogen, phosphorus, and potassium. Improving Plant Nutrition by Genetic Modification: Some Examples Rather than tailoring the soil to match the plant, genetic engineers are tailoring the plant to match the soil.

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