Healthy soil strong plants healthy people Soil T ypes around Brisbane wwwasriscsiroau Brisbane has four main soil types dark alluvial soils deep red loamy soils gravelly red and yellow loamy top soils over clay ID: 229849
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Slide1
Brisbane Organic Growers
Healthy soil, strong plants, healthy peopleSlide2Soil Types around Brisbane
www.asris.csiro.au
Slide3Brisbane has four main soil types:
dark
alluvial soils
deep red loamy soils
gravelly red and yellow loamy top soils over clayshallow gravelly soilsSlide4
Northside
Dark alluvial soils
Bald Hills, Brookfield, Eagle Farm, Fig Tree Pocket, Hamilton and Hendra
Southside
Dark alluvial soils
Bulimba, Fairfield, Hawthorne, Jindalee, Runcorn, Tennyson
Northside
Deep red loamy soilsBoondall, Bracken Ridge, Bridgeman Downs, Carseldine, Clayfield, Moggill, NudgeeSouthsideDeep red loamy soilsChelmer, Corinda, Eight Mile Plains, Graceville, Kuraby, Lota, Macgregor, Manly, Manly West, Oxley, Robertson, Rochedale, Sherwood Sunnybank, Sunnybank Hills, WynnumNorthsideGravelly red and yellow loamy top soils over clayAlderley, Anstead, Aspley, Auchenflower, Banks Creek, Banyo, Bardon, Bellbowrie, Brighton, Chapel Hill, Chermside, Deagon, England Creek, Enoggera, Enoggera Reserve, Everton Park, Ferny Grove, Fitzgibbon, Gaythorne, Geebung, Gordon Park, Grange, Grovely, Herston, Indooroopilly, Karana Downs, Kedron, Kelvin Grove, Kenmore, Kenmore Hills, Keperra, Kholo, Lake Manchester, McDowall, Milton, Mitchelton, Mt Crosby, Newmarket, Northgate, Nudgee Beach, Nundah, Paddington, Pinjarra Hills, Pinkenba, Pullenvale, Red Hill, Sandgate, Shorncliffe, Spring Hill, St Lucia, Stafford, Stafford Heights, Taigum, Taringa, Toowong, Upper Brookfield, Upper Kedron, Virginia, Wavell Heights, Wilston, Wooloowin, ZillmereSouthsideGravelly red and yellow loamy top soils over clayAcacia Ridge, Algester, Annerley, Archerfield, Balmoral, Belmont, Berrinba, Burbank, Calamvale, Carindale, Chandler, Coopers Plains, Coorparoo, Darra, Doolandella, Drewvale, Durack, East Brisbane, Ellen Grove, Forest Lake, Greenslopes, Gumdale, Heathwood, Hemmant, Highgate Hill, Holland Park, Holland Park West, Inala, Jamboree Heights, Karawatha, Larapinta, Lytton, Mackenzie, Mansfield, Middle Park, Moorooka, Morningside, Mt Gravatt East, Mt Ommaney, Murarrie, Norman Park, Pallara, Parkinson, Ransome, Richlands, Riverhills, Rocklea, Salisbury, Seventeen Mile Rocks, Sinnamon Park, South Brisbane, Stretton, Sumner, Tarragindi, Tingalpa, Upper Mt Gravatt, Wacol, Wakerley, West End, Westlake, Willawong, Wishart, Woolloongabba, Wynnum West, Yeerongpilly and YerongaNorthsideShallow gravelly soilsAlbion, Ascot, Ashgrove, Bowen Hills, Chermside West, Fortitude Valley, Lutwyche, Mt Coot-tha, New Farm, Newstead, The Gap, WindsorSouthsideShallow gravelly soilsCamp Hill, Cannon Hill, Carina, Carina Heights, Dutton Park, Kangaroo Point, Mt Gravatt, Nathan and Seven Hills
www.brisbane.qld.gov.au/environment-waste/green-living/green-homes/sustainable-gardening/soil-plants/index
Slide5Types of soilSlide6Soil profiles explained
O)
Organic matter
: Litter layer of plant residues
A)
Surface soil/Top Soil
: Layer of mineral soil with most organic matter accumulation and soil life.
B)
Subsoil: This layer accumulates iron, clay, aluminium and organic compounds, a process referred to as illuviation.C) Parent rock: Layer of large unbroken rocks. This layer may accumulate the more soluble compounds .R) Bedrock: R horizons denote the layer of partially weathered bedrock at the base of the soil profile. Unlike the above layers, R horizons largely comprise continuous masses (as opposed to boulders) of hard rock that cannot be excavated by hand. Soils formed in situ will exhibit strong similarities to this bedrock layer.Slide7How to self-test your soil
Texture
vs
Structure#1
The Squeeze Test-take a handful of moist soil, squeeze and open your hand Holds, but crumble with a light poke, yippee - you have
luxurious loam
Holds, but sits in a lump when poked, you have a
clay soil
Falls apart when you open your hand, you have a sandy soilSlide8How to self-test your soil
#2
The Percolation Test- to test your drainage
Dig a hole 30x30x30cmFill with water a allow to drain completelyFill the hole again with waterKeep track of how long to drain
> 4hrs = poor drainageSlide9How to self-test your soil
#3 The Worm Test
Dig a hole 30x30x30
Place the soil on cardboardSift through and count the worms
> 10 worms = pretty good + heaps of microbes and bacteriaLess worms = not enough organic matter and/or pH is too high or lowSlide10How to self-test your soil
#4 pH Test
Pick up a pH test kit from your garden centre
Do the simple test from various areas in the garden
pH 6-7.5 neutral, suits most plants, maximise nutrient availabilitypH < 5 acidic, most plants will not grow well and limited nutrient availabilitypH > 8 alkaline, most plants will not grow well and limited nutrient availabilitySlide11Why is pH important?Slide12Where did it all go wrong?
Natural recycling
of nutrients in the topsoil –
(rainforest)Farmers and gardeners had always worked on these principles
Justus von Liebig -19th century- NH3
Led to chemical fertilisers-NPK
Later developed Law of Minimum – all nutrients and minerals need to be present
Chemical
companies made NPK-how they changed their habits, easy to useSlide13A Soil Comparison
Healthy Soil
In balance - nutrients
Earthy sweet smell
Full of earthwormsFull of mineralsGood
structure
Dig with your hands
Plenty of organic matter
Healthy pHBiologically active ‘Dead’ SoilOveruse of chemicalsDepleted in organic matterSandy soils dry and lifelessClay soils like rockNo earthwormsDig with a mattock-if your luckyOften acidicBiologically deadSlide14If a good soil could be achieved by buying bags from the garden centre, we would all have great soils Sample
The basis for a healthy soil is organic matter and
the recycling
nutrients and mineralsMore about this laterSlide15The Good and The Bad News
You can have a healthy soil
Good news - no matter what type of soil you have, you can make good soil
Bad news – may need a little know how, some work and patienceSlide16Making Good from Bad, B
etter from Good
Whether your soil is clayey, sandy, loamy, low in nutrients, compacted or has poor drainage:
Add organic matter
Add organic matterAdding organic matter is the best way to improve your soil
Never throw away anything organic againSlide17Think of your soil as a living organism
Feed your soil, if your soil is healthy and in balance your plants will love you for it
Ask
yourself, will this be good or bad for my soil
Think about the Soil Food Web"The soil is like a farmer's bank. You've got to keep making deposits into it all the time. If you withdraw from it until it's empty, you'll be out of business." Slide18How to feed your soil
Feed your soil
Organic matter
Minerals
NutrientsSlide19Organic Matter
Compost
Humus
Soil structure
Layers of Carbon(C)Hay, leaves, grass, weeds, cardboard, paper, straw, pruning's etc. – NEVER throw out anything organic Layers of Nitrogen(N)Manures, blood & bone, comfrey, seaweed, legumes, organic fertiliser, kitchen scraps (poor chooks)
Layers of Minerals
Lime, dolomite, rock dust, soil and mature compostSlide20Compost continued
Sheet compost
For larger gardens
Same layered ingredients directly on the garden beds to form thick mulch layer
Place vegie scraps under mulch onto soil – earthworms will go crazySimilar to no dig gardenRepeat annuallySlide21Compost continued
Green Manure
Plant seeds and when fully grown either turn in to the soil or cut down as a mulch layer
Or let the chooks in!
Nitrogen fixing plantsLupins, lucerne, fenugreek,Sorghum, wild bird mix
Buckwheat
Weeds (pre seed)Slide22Minerals
Rock dusts
Natural soil
remineralizationSi,
Ca, Mg, P, S, K, Fe, Zn, Cu, Mn, Mo, CLime, dolomite, natural gypsum, basalt, granite, rock phosphate
Work best the finer they are
by increasing surface area
Minerals released slowly by weatheringSped up by organic (humic) acids and soil microrganisms (malic and acetic acids)Slide23Minerals continued
These weak acids release the constituent elements from rock dust into a usable soluble form
These elements are attached to soil colloids such as humus and clay and accessed by the plant through positive ion
exchange with H+
Work best when incorporated into compostOr incorporate into soil with the addition of compostSlide24Minerals continued
Natural Gypsum
Often referred to as a clay breaker, much more in the way of soil conditioner.
Links on the website
37 advantages http://www.cmtmi.com/gypsum.asp
5 key
benfits
http://www.croplife.com/article/33337/the-role-of-gypsum-in-agriculture-5-key-benefits-you-should-knowThese include: soluble source of Ca & S, improves acid soils, improves soil structure, increased water infiltration, increases stability of organic matter(sandy soil), helps earthwormsSlide25Nutrients
Looking at commercial fertilisers one might think the only nutrients are:
Nitrogen(N), phosphorus(P) and potassium(K)
These primary nutrients are important, but unless we have a balance of all minor nutrients, trace elements, carbon and other minerals, our soil cannot be balanced and provide optimum growth
The availability of the most abundant nutrient in the soil is only as good as the availability of the least abundant nutrient in the soil“WEAKEST LINK IN A CHAIN”Slide26Nutrients continuedSlide27Adding nutrients
Well prepared composts will replenish humus, minerals and nutrients and build a soil food web
The organisms involved in the soil food web release nutrients to the soil and roots
Use balanced organic fertilisers (like Organic Xtra) as they contain a full range of nutrients and are teeming with beneficial microbes. Slide28Nitrogen (N)
Nitrogen is largely responsible for
healthy leaf and stem
growth, required
to make protein in plants and is associated with chlorophyll. Nitrate nitrogen (NO
3
)
is the most readily available form of
nitrogen utilised by plants. It is also easily leached out of soils.Ammonia nitrogen (NH4) can be taken up by plants directly, but since it is rapidly oxidized by bacteria to the nitrate form (the nitrification process), it is usually in this nitrate form that it is taken up by plants. Ammonia nitrogen does not leach from soils.Urea nitrogen (CH4N2O) has to be converted to ammonia nitrogen (and on the nitrate nitrogen) by bacterial activity before it can be utilised by the plant. There can be some losses in this process, e.g. volatilisation Nitrite nitrogen (NO2) is toxic to plants. This is not normally a problem because nitrite is quickly converted to nitrate by bacteria. Slide29Phosphorus (P)
Phosphorus
is very important for root growth.
It also is crucial for producing
flowers and in the early stages of a plants life as it develops roots and shootsPhosphorus is often present in soils in an insoluble, unavailable form. Many factors including temperature and pH affect the availability of phosphorus to the plant.Slide30Potassium (K
)
Potassium
is needed for overall plant health
. It keeps the plants growing and aids their immune systems.Whilst nitrogen promotes soft lush growth, potassium balances this effect to produce firm compact growth.
The
two elements are needed in similar levels of
concentration.
Essential for the water regulation within the plant (turgor pressure) as well as the movement of carbohydrates and the creation of cellulose (Cell structure). Sufficient potassium is essential for flowering and assists with creating sweet, firm fruit and helps ensure plants have a good shelf life. Potassium is soluble in soils but moves relatively slowlySlide31By Tony de VereSlide32Summary
Composted organic
matter, or
humus, will help give your soil structure. It helps sandy soil by retaining water
and it corrects clay soil by making it looser. In all soils, it encourages beneficial microbial activity and it provides some nutritional benefits. Humus is natures way of feeding the circle of life.Adding organic matter will help replenish or "feed the soil".
Organic
fertilisers
, made from plant, animal or mineral sources, release their nutrients slowly, which means that plants can feed as they need to and there is no sudden change in the makeup of the soil which might harm the microbial activity
.Adding rock dusts to create mineral rich soils and plantsBy making healthy soil a focus at the start of making a garden, you will have a head start on creating a sustainable organic garden.Slide33
http://qldorganics.com.au/advice/links/Slide34
Thank you