soil - a hidden habitat, 2011 july web
DESCRIPTION
Makes aware of a hidden habitat: soil animals and micro-organisms are essential for fertile soils and safe production of food. Effects of diffrent farmers' practices are briefly mentionedTRANSCRIPT
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A Hidden HabitatSoil -
By Winfried Scheewe, 14 October 2010
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Who lives there?
What is going on there?
What farmers are doing?
What are the effects?
Why hidden?
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Who lives there? 1
Tardigradeor Water Bear
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Who lives there? 2
Nematodes
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Who lives there? 3
Actinomycetes
Fungi
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Who lives there? 4
Protozoa
Algae
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100 Insects and mites
110 Worms
250 Springtails
25,000 Nematodes
7,500,000 Protozoa
12,500,000 Algae
100,000,000 Fungi
125,000,000 Bacteria
One handful of fertile soil can contain :
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What is going on in the soil?
There are many kinds of soil animals and micro-organisms
What are their roles?
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Functions of soil organisms
Decomposing organic stuff
Maintaining a sponge like structure
Providing nutrients to plants
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Decomposing organic stuff
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Soil organisms help to bind soil particles together, give it a sponge like structure.
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Fixing Nitro-gen
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Mycorrhizae
Providing nutrients to plants
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Effects of farmers’ practices on the soil organisms
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Most pesticides are harmful to soil organisms
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Application of fertilizers
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Effects of farmers’ practices
Soil compaction
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Burning of crop residues
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Bare soil after burning the stubbles
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Differences farmers can make
Returning rice straw
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Example: Farm of Isidro Prado
After 15 years of using fertilizers, Zinc deficiency became a problem, yield declined by 60 to 70%
Straw application: within two years, yield back to normal levelsof over 4.5 t/ha(40 sacks from 0.38 ha)
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Differences farmers can make
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Soil cover
SOIL EROSIONCORN WITH A COVER CROP
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Preventing soil erosion with hedgerows and mulch
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Thank you !