Soils and Farming. Desertification Intro Video Clip.

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Presentation transcript:

Soils and Farming

Desertification Intro Video Clip

Soil Formation Soil: complex mix of rock particles, decaying org. matter, air, water, and living orgs. Rocks add nutrients Decaying organic matter = dead orgs, leaf litter, etc.

Fertile Soil Will have many nutrients Takes yrs to form.

Soil Layers Mature Soils have layers: horizons. Top: O horizon: fresh leaves, twigs, animal feces! 2 nd layer: A horizon: aka topsoil. Partially decomposed org. matter called humus. Many bugs, nutrients.

Humu s

Not Hummu s!

Soil Layers 3 rd layer: B horizon: aka subsoil: has inorganic material 4 th layer: C horizon: rock not broke down.

Soil Texture and Porosity 3 diff. sizes of soil particles Clay: smallest: > mm Silt: 0.05 – mm Sand: biggest, 2 – 0.05 mm

Porosity and Permeability Porosity: Measure of spaces per volume of soil. Porous soil holds more water and air Permeability: how fast H 2 O/air move down in soil.

Loam Soils Mixes of all sizes of soil. Medium permeability and porosity I Love Loams

High Input Farming/Tillage Prod. a lot of food! Lots of fossil fuels, water, commercial inorganic fertilizers and pesticides used. Makes 1 type of food (monoculture).

But It Destroys Soil… Plowing brings up topsoil (A) layer to O layer. Loose soil is then exposed to wind and water  carried away- soil erosion.

Green Revolution 1950’s 1) Plant monocultures 2) Use much fertilizer, pesticides, and H 2 O 3) Increase intensity of planting PRODUCES A LOT OF FOOD!

Sustainable/Low Input Agriculture Reduces irrigation, pesticide use, Uses organic fertilizers. Soil conservation techs. Less food

Organic Farming Low Input Farm No inorganic fertilizers or chem. pesticides used No GMOs

Soil Conservation Tech’s Terracing: slope converted into broad terraces to retain H 2 O and soil

Rice Terracing

Contour Farming: plowing and planting in rows across the slope of the land (slow water and soil runoff) Soil Conservation Tech’s

Contour Farming

Strip Cropping: Plant a row of 1 type of plant, then plant a row of another type of plant (keeps nutrients in and holds soil). Soil Conservation Tech’s

Strip Cropping

Windbreaks: slows wind down before it hits the farm land. Soil Conservation Tech’s

Windbreak

Inorganic Fertilizers High amounts of NO 3, NH 4, and PO 4. Easily transported, stored, and applied. Do not add humus to soil, release nitrous oxide (greenhouse gas) when applied, causes eutrophication in streams.

Organic Fertilizers 3 types: 1) Animal manure: dung/urine of animals (add mucho nutrients) 2) Green manure: plants plowed into soil to add nutrients for next crop. 3) Compost: semi-broken down org. matter; adds nutrients and stops soil erosion. Compost

Why do People Go to Farmer’s Markets? LOCALLY GROWN PRODUCE!

Why Better? Lower fuel emissions of greenhouse gases Less gas used Less transport of pests Less packaging Lower costs of produce Revenues remain local

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