building sustainable communities - usda · building sustainable communities ... sustainable...
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Building Sustainable Communities
• Promote user friendly integrated cropland management and technology exchange
• Share resources, including Integrated Water Management Handbook on NRCS website: http://www.nm.nrcs.usda.gov, click on Irrigation
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Sustainable Agriculture Workshops Purpose
• Show how to evaluate site-specific conditions
• Learn how to build soil quality and improve overall farming system
• Promote development of sustainable communities
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Understanding the Landscape
This soil is naked, hungry, thirsty and running a fever!
Ray Archuleta 2007
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C
Energy flow, Water cycle, Bio-Community Dynamics and the Nutrient cycle
At the field level: Tillage disrupts Ecosystem Processes!
NPK
Ray Archuleta
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Bare fields do not convert light energy into chemical energy
Heat
Producers (plants and other photosynthetic organisms)
Chemical energy
Heat
Consumer
Consumer
Ray Archuleta
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Physical disturbance (tillage) disrupts the water cycle at the soil pore!
-Six et al., 2002
Plant root
Runoff
Infiltra
tion
Runoff
Bacteria
Hyphal net
Plant root
Microaggregate
Glomalin (soil glue):
•holds soil particles together
• which increases infiltration
• help prevents sealing of the soil surface
EffectiveNon-effective
Ray Archuleta 2007
Glomalin
Photo by Sara Wright
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Loss of SOM as CO2
CO2CO2CO2
PHYSICAL DISTURBANCE: Tillage induces the native bacteria to consume soil carbon; byproduct is C02.
Tillage disrupts the Pore space which impacts the water cycle
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Clear runoff from no-tilled field
No-tilled fieldConventional-tilled field
Sediment runoff from conventional-tilled field
Impact of disturbed Aggregates
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Holding SOM (C) by no-till and crop rotation
All the atmospheric CO2 ~ only 40% of the soil’s C holding capacity (Wallace 1984)
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Physical disturbance (tillage) disrupts Bio-Community Dynamics
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Most Biological Activity Occurs Underground
Soils contain about 7.75 to 15 tons of bacteria, fungi, earthworms, mites, nematodes, or protozoa per acre
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Roots
Soil organic matter & residues
Root feedingnematodes
Fungi
Bacteria
Fungus feedingmites
Flagellates
Bacteria feedingnematodes
Amoebae
Predatorynematodes
Predatorymites
What happens when an organism is missing?
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Stability tends to Increase with Increasing Complexity
Allen Savory: Holistic Mgmt
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In the Ecosystem-Collaboration is more apparent than Competition:
ND case study: 2006 Production On Burleigh District Plot with 1.8 in. of rain
Oilseed Radish 1260 Lbs. Purple Top Turnip 1513 Lbs. Pasja Turnip 2070 Lbs. Soybean 1496 Lbs. Cowpea 1914 Lbs. Lupin 1232 Lbs. Cocktail Mix (1/2 Rate) 4785 Lbs. Cocktail Mix (Full Rate) 4350 Lbs.Cowpea (10 lbs.) Soybean (15 lbs.) Millet (7 lbs.) Radish (1 lb.)Turnip (½ lb.) Sunflower (1 lb.)
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Collaboration at work: Cover Crops Keepsoil cover and provide nutrients.
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Soil Temperatures
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When soil temperature reaches...140 F Soil bacteria die
130 F 100% moisture is lost throughevaporation and transpiration
113 FSome bacteria species start dying
100 F 15% of moisture is used for growth85% moisture lost through evaporationand transpiration
95 F
70 F 100% moisture is used for growthJ.J. McEntire, WUC, USDA SCS, Kernville TX, 3-58 4-R-12198. 1956
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Allow plants to feed microbes and microbes feed plants
Nutrients from Fertilizer Nutrients from below C
NPK
Physical disturbance (tillage) disrupts the Nutrient Cycle
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In Conventional Tillage systems
Bacteria-dominated food web
(Bacteria have 20-30% C-use
efficiency)
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In No-Till systems
Fungi-dominated food web
Nematode and fungal relationship(Fungi has 40-55% C-use efficiency)
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First: Capture the sun1) Time- duration and rate of plant growth 2) Density of plants3) Surface area of leaf Ray Archuleta
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Second: Soil is not a machine, it is an Ecosystem. A functioning ecosystem needs protection and energy.
Soil Surface
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Third: Mimic Nature. Nature rewards diversity. Microbes in the living soil need diversity
CC C SOIL BANK
Wheat - Fallow
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Continuous Cover and Crop Diversity
CCC C
SOIL BANK
C
Continuous Wheat
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Continuous Cover and Crop Diversity
C C C CC
C CCSOIL BANK
C
CC
Maximize Diversity
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Continuous Cover and Crop Diversity
C C CC
CC
C C CCC SOIL BANK
CC CC
CC
Maximize Diversity with Cover Crops
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Before Primary Tillage
After Primary Tillage
After Secondary Tillage
Dr. D.C. Reicosky, ARS, Morris, MN.
Four: Manage Disturbance (Physical and Chemical)
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ANOTHER PHYSICAL DISTURBANCE : REPEATED OVERGRAZING
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Physical disturbance: Over-irrigation
Surface water: Flood irrigation
Reused irrigation drainage water
Ground water
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Slide 28
Compaction
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Chemical disturbances: over-application of pesticides, fertilizers and manures
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The foundation of our modern agriculture
OilNatural GasModern Agriculture uses 22 % of oil on a yearly basis
Agriculture and Forestry production use 22 %Transportation uses 25% of our oil on a yearly basis
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CO2CO2
Economics:
Disturbance Costs You Money
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2006 Tractor Fuel Bill
$1,505.34
$6,919.40
$8,665.89
0
5000
10000
Conventional Till Minimum Till No-Till
Tillage System
Dollars $
Pennsylvania No-Till Alliance 10/05
TAKE HOME: MORE SOIL DISTURBANCE EQUALS MORE FUEL USAGE
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Nutrients from Fertilizer Nutrients from below C
NPK
Understand the Ecosystem processes and the ecological
principles you will create Synergy
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Sustainable
Low energy
Not Sustainable
High energy
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Economics on a No-till systemNo-till with Cover CropsRye (1 bu./ac.) $15.00
Vetch ( 20 lb./ac) $17.00
Radish (4 lb./ac) $10.00
Round up $ 7.00Cr. Clover( 5 lb./ac.)
$8.00
Planting/Rolling per AC.Cover Crop
$ 25.00
Total $82.00 per/ac.
No-till without Cover Crops18-46-0 *(18 units of N)
$52.00
*(162 units of N)(30% N)Mar. 2 2008 price-
$160.00
Round up $ 7.002 lb Atrazine and Simazine
$ 12.00
Total $231.00 per/ac.
*Units of N recommended by NC State University$149.00 per ac. savings
Costs as of 3/1/2008
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HIGH SOIL QUALITY LEADS TO HIGH SILAGE QUALITY.
Ray’s silage provides enough energy- no extra corn needs to be added to the feed ration!
Which saves $ 1,638.00 for every 65 head of stocker steers!
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Understanding Soil Health: The Only Sustainable Green Revolution!
4 “C”
• Capture sunlight-make carbon (energy)
• Copy Nature (mimic diversity) with cover crops, intercropping and cover the soil at all times.
• Control physical and chemical disturbance
• Converge cropping and grazing systems together
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Super Heros
Among others in a healthy soil system!