2. Creating a sustainable food system: Step
1- sustainable food production
Earthfriends 1995
“The Whole Story
of Food”
3. Outline
Soil health: basis for sustainability
Agroecosystem health: Mimicking the
natural system
• Land Institute: Designing a new system
• Slash Mulch System: Assessing a traditional mimic
• Restoration of oak savanna with Highland cattle:
Substituting domesticated for wild
Landscape health: connecting the
agroecosystems
Re-wilding the farm
• Nature Conservancy Cosumnes River Project, CA
4. John Doran defn of soil quality or soil
health (often used interchangeably)
“Quality” academics vs. “health” by non-
academics
“The continued capacity for soil to function
as a vital living system, within ecosystem
and land-use boundaries to:
sustain biological productivity
promote quality of air and water environments
maintain plant animal and human health”
Doran and Safley 1997
5. Soil provides “ecosystem
functions or ecosystem services”
Cooperband: Infiltration, water retention,
absorption of nutrients, degradation of
pesticides, pollutants, stabilizing soil
temperatures
Sequestration of carbon dioxide,
decomposition of organic substrates
Other ecosystem services can be predation
of insect pests and pollination (not nec.
Soil)
6. Indicators of soil quality
Physical
water infiltration - percolation tests
texture and structure
Chemical
Organic matter
pH (“the master variable”)
Biological
earthworm population (25/ft3)
Zimmer,G. 2000.
7. Soil health associated with
organic matter content
Organic matter in soil is basically the
compost that Leslie talked about
Organic matter is about all
that we can easily change
Neutral pH needed for
earthworms
8. Human health dependent on
Plant and Animal health, which is
dependent on
Soil Health
Mismanagement of soil has lead to poverty,
malnutrition and economic disaster
9. Soil, plant, human linkage:
The case of Selenium
Naturally found in soil and water
Irrigation of Central Valley in CA [Se]
Certain native and other plants accumulate
Essential nutrient in animals and humans
and can be deficiency
Cofactor in antioxidant enzymes
Important in Vitamin D absorption
In large quantities is poisonous to livestock
and humans causing muscle tremors, etc.
Cihacek, Anderson, Barak 1996
10. Soil is totally critical
But there is more...
Not so linear
What sustains plants and animals is not just
soil
11. Mimicking the natural system
Agroecosystem mimic the native ecosystems
Only ecosystems that are present that
1. maintain or build their ecological capital,
2. fix and hold their nutrients,
3. are adapted to periodic stress, such as
drought and fire, and
4. manage their weed, pest and pathogen
populations.
12. Tropical Ecosystem mimic:
Traditional slash mulch system
Pre-Hispanic, swidden (migratory)
Bean, corn, root crops also sorghum and rice
Key characteristic is mulch of secondary
vegetation (not primary) that is not burned
Fallow part of system
System produces 30-40% of Costa Rica’s beans
(1994)
Costa Rica beans: household use 40%,
commercial 60% of production (1994)
24. Bean diseases: Effects of the mulched
and unmulched systems
With Mulch
Anthracnose - significantly less
(Colletotrichum lindemuthianum)
Fusarium-type root rot -
significantly less
Root knot nematode -significantly less
(Meloidogyne spp.)
Rhizoctonia-type root rot -
25. Biological impact summary
Less foliage and root disease with exception
Rhizoctonia root rot in mulched system
Different nematode communities in
mulched and unmulched systems, less
morphospecies diversity in soil of mulched
Greater arthropod diversity in soil of
mulched systems
26. In summary
The traditional system appears to be
sustainable because it imitated the natural
system root-litter mat
limiting nutrient more available
avoidance of disease
27. Land Institute
“Natural Systems Agriculture
is a new paradigm for food
production, where nature is
mimicked rather than subdued
and ignored. Because we are
located in native prairie, we
look to the prairie as our
model for grain crops. As a
result, we are investigating the
feasibility of perennial
polycultures or mixtures of
perennial grains.”
28. Ecosystem function follows structure
Have identified four functional groups in prairie:
cool-season grasses, warm-season grasses,
legumes and composites. Has identified
perennials in all groups:
cool-season grasses: wild rye, perennial wheat,
warm-season grasses: bunchgrass (3x higher in protein
than corn),
legumes (Fabaceae): Illinois bundleflower (38%
protein),
composite (Asteraceae): Maxmillian sunflower (oil)
29. Tall grass prairie:
perennial and polyculture
Perennial polyculture at the Land Institute
Maxmillian sunflower and Monarch Butterfly (upper)
31. Perennialization
Breed perennial characteristics into existing
grains like wheat
Breed edible grain characteristics into
perennials
Suggests genetic engineering may be a
useful approach
Marty Bender and Jerry Wild (KSU)
looking for sunflower moths
32. Genetic Engineering: what is it?
Genetically Engineering (GE): Transfer of
genes from one organism-- plant, animal or
microbe-- to another using biotechnology, not
conventional breeding.
Genetically Modified Organism (GMO) is a
term that is somewhat misleading since the
process of plant adaptation or conventional
breeding can be a genetic modification
Transgenic
33. GE is not hybridization
Hybrids are conventionally bred from two
inbred parents
Advantage is the the F1 generation (the plants
from the bought seed) is uniform and recessive
genes are unexpressed
Issues are the the seed saved is variable in
quality so that it is not useful to save
Need to continually buy seed
Has supplanted open-pollinated varieties
34. Assembling the agroecosystem
synthetic communities of plants, animals,
and micoorganisms that are stable,
productive, and close enough in form to the
native community that the essential
functions of pest resistance, soil stability,
and nutrient cycling are preserved.
36. Can livestock substitute for natural grazers
and browsers? we meet conservation goals
and produce livestock too?
Scottish Highland cattle
foraging on brush and grass
37. Can we manage the animals so that
the rare herbaceous oak savanna plants
are impacted positively?
38. Farming with the wild
Beyond organic
“We cannot have healthy farms in a
degraded landscape. Quite apart from the
problem of drift-- whether chemical or
genetic-- there is the fact of the biodiversity
necessary to produce the ecosystem services
on which our organic farms depend can
only be restored and maintained on an
ecosystem level”-- Kirschenmann and
Gould
39. “The idea that organic farms are enclaves of
purity-- that everything within their
boundaries is God-like and everything that
lies outside their boundaries is evil-- is a
patch ecology perspective that must be
reconsidered.” --Kirsh. and Gould
identify ecological neighborhoods
how can agriculture fit into them by effectively
using the ecosystem services they provide
• microorganisms and soil quality; predators of
insect pests and native pollinators
40. The Nature Conservancy- Cosumnes
River Landscape Level Project
42,000 acres
Agencies -
State Fish and Wildlife
EPA
UC Davis
Organic rice farmers
livestock grazers in
buffer areas
44. Other Wild Farm pioneers
Wildlands corridor Coon Mt. to Split Rock
Wildway to link Lake Champlain to
Adirondacks. Land trusts and Black Kettle
Farm- maximizes biodiversity
Chile Parque Pumulin- viable rural
economies with demonstration organic
farms (800,000 acres)
Costa Rica- Palo Verde National Park-
cattle used to clear vegetation
Paseo Pantera Mesoamerican corridor
45. Restoration of soil fertility at level of
a country: case of Cuba
Type Area
(M ha)
% Rehabil.
1990
Erosion 3681 86.1*
Saliniz. 780 0.1
Acidity 1133 26.5
Poor drain 100 6.7
Low SOM 3000 94.1
* principally via agronomic methods like contour plowing etc.
46. Methods to maintain and restore soil
fertility in Cuba
1) Soil Amendments
a) Organic matter- leaf-cutting ant refuse, leaf
litter, compost, green manures, cover crops,
worm compost (from vermiculture), urban
garbage, crop residues, processing of
agricultural by-products
b) Crushed rock and lime
c) Physically moving eroded soil and organic
matter from lowlands to highlands
47. d) Biofertilizers
N-fixing organisms:
symbiotic-Rhizobium (bacteria) Cuba- 80% N
supplied for legumes
free-living-Azotobacter (bacteria) Cuba- 40-
50% of N supplied in non-legumes
P-solubilizing-Bacillus (bacteria)
VA Mycorrhizal Fungi-
Available commercially in Cuba (and US)
48. For sustainable food system-
food production:
We need to restore soil
We need to restore connectivity of
landscape
Work from landscape level perspective for
sustainable food production and quality of
life
49. References
Imhoff, D. 2002. Farming with the Wild.
In: Fatal Harvest.
Soule, J.D. and J.K. Piper. 1992. Farming
in Nature's Image. Island Press
Jackson, L. and Jackson, D. 2002. The
Farm as Natural Habitat Island Press
50. Cihacek, Anderson, Barak. 1996. Linkages
between Soil quality and plant, animal and
human health. In: Methods of Assessing
Soil Quality. SSSA Spec. Pub. #49
Zimmer, G. 2000. The Biological Farmer:
A Complete Guide to the Sustainable and
Profitable System of Farming