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AP Biology Soil health as a global issue Soil conservation & sustainable agriculture maintaining healthy environment sustainable production of food supply economically viable farming industry contour plowingcrop rotation “A sustainable agriculture does not deplete soils or people.” – Wendell Berry cover crops
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AP Biology Global issues soil fertility erosion irrigation forestry destruction
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AP Biology
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Fertilizers “Organic” fertilizers manure, compost, fishmeal “Chemical” fertilizers commercially manufactured N-P-K (ex. 15-10-5) 15% nitrogen 10% phosphorus 5% potassium What are the political, economic, environmental issues?
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AP Biology Nitrogen uptake Nitrates plants can only take up nitrate (NO 3 - ) Nitrogen cycle by bacteria trace path of nitrogen fixation! What will the plant use N for? root
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AP Biology Soybean root nodules N fixation by Rhizobium bacteria symbiotic relationship with bean family (legumes)
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AP Biology Increasing soil fertility Cover crops growing a field of plants just to plow them under usually a legume crop taking care of soil’s health puts nitrogen back in soil erosion control, too A farmer … outstanding in his field? Plow it under? Why would you that?
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AP Biology 2006-2007 Some plant oddities…
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AP Biology Parasitic plants tap into host plant vascular system Indian pipe Mistletoe
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AP Biology Plants of peat bogs High acid environment most minerals & nutrients bound up & are not available to plants must find alternative sources of nutrients
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AP Biology Carnivorous plants Are they really carnivores? Pitcher plantVenus fly trap Sundew
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AP Biology Pitcher plant
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AP Biology Uses of peat
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AP Biology 2006-2007 Any Questions??
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