38.2 The Role of Soil in Plant Nutrition

get a hint

hint

iron deficiency

iron deficiency

The ________ found in the organic- rich soils is less likely to erode than it is to blow away with water or wind.

iron cata

The ________ has more branched roots and longer root hairs.

Cell processes

________ have evolved to increase their ability to get PO 3- from soil by increasing the amount of nitrogen produced from N ..

Genetic engineering

________ has not yet affected plant growth.

Gardeners

________ mix organic materials and sand into silt or clay- rich soils to improve their aeration properties.

Farmers

________ add organic or inorganicfertilizers to cope with reduced soil fertility.

Compost

________ is mixed with garden soil to improve its fertility.

Sand grains

________ range from 2mm to 6mm in diameter.

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.

nitrogen fixing prokaryotic organisms

The ________ use plants that can harm other aquatic life- forms.

Sand

________ may have heavy metals in it, such as aluminum.

Heavy rain

________ can reduce the shape of sand particles and allow air and water to move the fertility of soils.

Deep lying minerals

What are conveyed to the surface by plant roots? Answer with a single words or term.

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.

free ion

The ________ can be washed out of the soil.

New genes

What are transferred into the plant? Answer with a single words or term.

Crop plants

________ may also produce phos cally engineering biological nitrogen fixation.

soil properties

The ________ affect plant growth.

Crop scientists

________ are working to increase nitrogen availability through the use of genes.

Cation exchange

________ occurs when the cations are replaced by the protons.

Compost

________ is created when gardeners layer small amounts of soil with vegetable waste from the kitchen and yard waste.

Compost

________ can be used to increase the organic and mineral content of garden soils.