The ________ found in the organic- rich soils is less likely to erode than it is to blow away with water or wind.
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iron cata
The ________ has more branched roots and longer root hairs.
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Cell processes
________ have evolved to increase their ability to get PO 3- from soil by increasing the amount of nitrogen produced from N ..
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Genetic engineering
________ has not yet affected plant growth.
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Gardeners
________ mix organic materials and sand into silt or clay- rich soils to improve their aeration properties.
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Farmers
________ add organic or inorganicfertilizers to cope with reduced soil fertility.
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Compost
________ is mixed with garden soil to improve its fertility.
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Sand grains
________ range from 2mm to 6mm in diameter.
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reduction
The large populations of algae are fostered by two hydrogen atoms (2 H), a reaction powered by the breakdown of by fertilizers that wash from farm soils into rivers. A(n) ________ occurs three times with the addition of a total sissippi River.
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nitrogen fixing prokaryotic organisms
The ________ use plants that can harm other aquatic life- forms.
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Sand
________ may have heavy metals in it, such as aluminum.
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Heavy rain
________ can reduce the shape of sand particles and allow air and water to move the fertility of soils.
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Deep lying minerals
What are conveyed to the surface by plant roots? Answer with a single words or term.
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high cost offertilizer
The ________ helps to explain why acids- a high price to pay- but apparently one that is essential for the agricultural scientists are so interested in the possibility of geneti plant to obtain sufficientphosphate.
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free ion
The ________ can be washed out of the soil.
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New genes
What are transferred into the plant? Answer with a single words or term.
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Crop plants
________ may also produce phos cally engineering biological nitrogen fixation.
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soil properties
The ________ affect plant growth.
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Crop scientists
________ are working to increase nitrogen availability through the use of genes.
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Cation exchange
________ occurs when the cations are replaced by the protons.
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Compost
________ is created when gardeners layer small amounts of soil with vegetable waste from the kitchen and yard waste.
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Compost
________ can be used to increase the organic and mineral content of garden soils.