fred magdoff dept. plant & soil science soils the unappreciated natural resource
TRANSCRIPT
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Fred MagdoffDept. Plant & Soil Science
Soilsthe unappreciated natural resource
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You ask me to plow the ground. Shall I take a knife and tear my mother’s breast?
— Native American Chief
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Many a hillside do the torrents furrow deeply, and down to the dark sea they rush headlong from the mountains, with a mightly roar, and the tilled fields of men are wasted.
— The Iliad
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... for soil thou art and unto soil shalt thou
return.
— Book of Genesis
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Then God Yahweh formed man out of the soil of the earth
— Book of Genesis
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Adam — from Hebrew word for soil Eve — from the word for life
Soil + Life
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Are you really “made” out of soil?
Where did the following come from:
•calcium in your bones
•phosphorus in bones and fats and nucleic acids
•nitrogen in proteins
•iron, potassium, magnesium, etc.
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Are you really “made” out of soil?
And where did the carbon come from?
— From plants growing on and in soils and that fixed atmospheric CO2.
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What do plants need?
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What do plants need?
Light Warmth Carbon dioxide (CO2) Oxygen (O2) Water Nutrients Anchorage
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What do plants need?
Nutrients C, H, O, N, P, K, Mg, Ca, S, Fe, Cu, Co, Ni, Mn, Mo, B, Zn, Cl
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What do soils provide to plants?
Oxygen (O2) to roots Help get rid of CO2 Water Most nutrients Anchorage
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What else do SOILS provide?
Partitioning rainfall (runoff vs. infiltration)
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What else do SOILS provide?
Partitioning rainfall (runoff vs. infiltration)
Storehouse for Carbon
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carbon dioxide (CO2)(0.04% in the atmosphere)
root respirationand soil organic
matter decomposition
crop and animal residues
photosynthesis
respiration in stems
and leaves
crop harvest
Fig. 4.6 The role of soil organic matter in the carbon cycle.
carbon in soil
organic matter erosion
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What else do SOILS provide?
Partitioning rainfall (runoff vs. infiltration)
Storehouse for Carbon Cleansing pollutants (seepage
fields, manures, sludges)
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Soils are a “living filter”
As water percolates through a soil
• pathogens may be deactivated
• Phosphorus is removed
• Nitrogen is removed
• Carbon is removed
• Many harmful chemicals removed
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What else do SOILS provide?
Partitioning rainfall (runoff vs. infiltration)
Storehouse for Carbon Cleansing pollutants (seepage
fields, manures, sludges) Building material
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What else do SOILS provide?
Partitioning rainfall (runoff vs. infiltration)
Storehouse for Carbon Cleansing pollutants (seepage
fields, manures, sludges) Building material Something to build on (buildings,
roads)
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What are soils made of?
Minerals
Organic matter
Pores(water &
air)
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What are soils made of?
Minerals
Organic matter
Pores(water &
air)
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Minerals
SAND2mm to 0.02mm diametersmall pieces of minerals that are found in rocks such as quartz, feldspars, and amphiboles (alumnosilicates)
SILT0.02 to 0.002mm diameterminerals similar to sand
CLAY<.002mm in diameter and colloidalfrequently formed in soils Many types of clays (with different properties)Most clays have plate-like structure contain negative charge (cation exchange capacity, CEC).
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What are soils made of?
Minerals
Organic matter
Pores(water &
air)
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Organic Matter
LivingDeadVery Dead
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Plants have evolved in a dynamic
relationship with other organisms
Living
• Beneficial and harmful
• Above and in the soil
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—Living —nematodes
fungi
bacteria
mites
earthworms
springtailsmoles
plant roots
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Figure 2.1 A nematode feeds on a fungus, part of a living system of checks and balances. Photo by Harold Jensen.
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Figure 3.2 Root heavily infected with mycorrhizal fungi (note round spores at the end of some hyphae). Photo by Sara Wright.
spore
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Figure 3.2 a. Sticky substance, glomalin, surrounding root heavily infected with mycorrhizal fungi. Photo by Sara Wright.
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energy flows in direct ion of arrows
ground beet les 8 - 20 mm
1o = first level consumers
2o = second level consumers
3o = third level consumers
2o
2o- 3o
predatory mite .5 -1 mm
1o
2o
fly 1- 2 mm
rove beet les
rot ifera
1obacteria
fungiact inomycetes
lengths of organisms given in millimeters (25 mm = 1 in)
1 mm
1- 2 mm
scorpion1- 2 mm
70 -150 mmflatworms
ant5 -10 mm
10 mm
pseudo-
beet le mites
nematodes 1mm
nema-todes
.5 - 3 mmspringtails
sowbug10 mm
beet le
cent ipedes50 mm
earthworms50 -150 mm
mold mitebeet le mites1 mm
millipedes20 - 80 mm
.1- .5 mm
protozoa.01- .5 mm
2o
1o
1o
land slugs& snails 2 - 25 mm
2o
organic residues
feather-winged
white worms10 - 25 mm
Figure 3.1 Soil organisms and their roles in decomposing residues. Modified from D.L. Dindal, 1978.
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— “Dead” —
Fresh residues in early stages of decomposition
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— “Dead” —
Food supply for the vast number
of organisms that live in the
soil
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Figure 2.2 Partially decomposed residues (the “dead”) removed from soil. Fragments of stems, roots, fungal hyphae, are all readily used by soil organisms.
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— “VERY Dead” —
Well decomposed material, humus
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Humus
• Colloidal
• Has many negative sites (can hold onto cations such as Ca++, Mg++, K+ = CEC)
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Figure 4.5 Corn grown in nutrient solution with (right) and without (left) humic acids. Photo by R. Bartlett.
In this experiment by R. Bartlett and Yong Lee, adding humic acids to a nutrient solution increased the growth of both tomatoes and corn and increased the amount and branching of roots.
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What are soils made of?
Minerals
Organic matter
Pores(water &
air)
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Figure 6.1. Distribution of solids and pores in soil.
air
waterminerals
organic matter
solids pores
Soil dries down
Soil wets-up during
rain
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air
waterminerals
organic matter
solids pores
Soil wets-up during
rain
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air
water
minerals
organic matter
solids pores
Soil dries down
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large pore
intermediatepore
small pore
Aggregate (crumb)
Figure 6.3 A well aggregated soil has a range of pore sizes. This medium size soil crumb is made up of many smaller ones. Very large pores occur between the medium size aggregates.
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Add organic matter
Increased biological activity (& diversity)
Decomposition
Nutrientsreleased
Aggregation
increasedPore structure
improvedHumus and
othergrowth
promotingsubstances
Reducedsoil-borne diseases,parasitic nematodes
Improved tilthand water storage
HEALTHY PLANTS
Harmful substances detoxified
Figure 4.1 Adding organic matter results in many changes. Modified from Drinkwater & Oshins, 1999.
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What causes soils to be different from one another?
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What causes soils to be different from one another?
parent material — The material from which
the soil derived. For example:
Lake bottom (much of Champlain Valley lowlands)
River flood plains (alluvial)Wind-blown material (loess)Rocks in place or moved by
glacier
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What causes soils to be different from one another?
position in the topography
— Soils on slopes are kept “young” because of erosion while those at the bottoms receive extra water and sediments from upslope.
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What causes soils to be different from one another?
Climate — Intensive weathering
under hot and humid conditions.
— Weathering and soil development are very slow under arid conditions.
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What causes soils to be different from one another?
vegetation — Grassland soils tend to
have much higher levels of organic matter and are more fertile than soils developed under forest.
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What causes soils to be different from one another?
time — It takes time for forces of
weather and influence of vegetation and slope position to be expressed.
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What causes soils to be different from one another?
human activity — Humans have a major
influence on many of the world’s soils. (Accelerated erosion, depletion of soil nutrients by intensive cropping, installation of tile drainage, etc.)
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Tama soils were formed in silty material, called loess, under tall prairie grasses that have a deep fiberous root system and under relatively humid climate. Grasses have added organic matter, producing a relatively thick, dark surface layer. Erosion is a continuing problem with these soils.
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The Paxton series consists of very deep, well drained soils on glacial till uplands. The dense subsurface till is characteristic of Paxton soils. Permeability is moderate in the surface layer and subsoil and slow or very slow in the substratum. Available water capacity is high. Very strongly acid to moderately acid. A seasonal high water table is at a depth of 1.5 to 2.5 feet.
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Tifton soils occur throughout the Southern Coastal Plain in Georgia. Tifton soils formed in loamy sediments of marine origin. They are among the most important agricultural soils in the State. Cotton, peanuts, soybeans, and corn are the principal crops grown on these soils.
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Drummer soils consists of very deep, poorly drained soils that formed in 40 to 60 in. of loess or other silty material and in the underlying stratified, loamy glacial drift. These soils formed under prairie vegetation. Drummer soils are the most extensive soils in Illinois. They are the most productive soils in the state. Corn and soybeans are the principal crops.
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The Chesuncook soil series typifies the northern temperate and cool forested regions of Maine — moderately well drained on till plains, hills, ridges, and mountains. These soils have a high woodland productivity rating. The most common tree species are red spruce, balsam fir, yellow birch, American beech, sugar maple, white ash, and red maple.
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Hilo soils have historically been used for sugarcane crops. With the decline of the sugar industry, there has been a shift toward truck crops, such as ginger and taro; orchard crops, such as macadamia and papaya; and forestry. These soils cover about 14,500 acres and are considered prime agricultural land. The Hilo series consists of very deep, moderately well drained soils that formed in many layers of volcanic ash with lesser amounts of dust from the deserts of central Asia.
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Windsor soils are well suited to the highly diversified agriculture of Connecticut. They are the preferred soils for the production of shade tobacco. They are important for the production of fruit and vegetable crops, silage corn, and ornamental shrubs and trees. The Windsor series consists of very deep, excessively drained, rapidly permeable soils.
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Bayamón soils are interspersed between limestone hills (haystacks) in northern Puerto Rico. They are used for sugarcane, pineapples (pictured above), a wide variety of food crops, pasture, and hay. Bayamón soils, formed in highly weathered, clayey marine sediments, they have low or medium fertility and are strongly acid to extremely acid throughout.
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Houston Black soils are important agricultural soils. They are used extensively for grain sorghum, cotton, corn, small grains, and forage grasses. They also are important soils in many urban areas.) than any other state. These soils shrink when dry and swell when wet. Texas has about 15 million acres of Vertisols. Almost 2 million acres, or 13 percent, consists of Houston Black soils.
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