[permaculture] Phosphorus Theft
fdnokes at hotmail.com
fdnokes at hotmail.com
Tue Dec 8 16:03:27 EST 2009
Thanks for the fabulous post, Keith.
I look forward to mining it for all its worth.
Looks like we humans are going to have to 'get with the program' when it
comes to phosphorous.
All we seem to hear about is carbon.
P.S. I realized my ignorance on this subject, and will be studying your
message thoroughly to get more up to speed.
Phosphorous is generally overdone in the Standard American diet. That's one
context I'm familiar with phosphorous.
That, and the phosphate issue of lakes, etc.
Like I said, I'm grateful to you for this 'mother load' of information!
Please keep these posts coming!
From: "Keith Johnson" <keithdj at mindspring.com>
Sent: Tuesday, December 08, 2009 12:50 PM
To: "permaculture" <permaculture at lists.ibiblio.org>
Subject: Re: [permaculture] Phosphorus Theft
> fdnokes at hotmail.com wrote:
>> I've never been a fan of fertilizer, and the permaculture movement is
>> largely about supporting nature to create good soil, but it does make
>> to acknowledge that the current infrastructure that is responsible for
>> feeding the millions does rely on phosphorous.
> It is not merely the "current infrastructure of agriculture" that
> depends on phosphorus but all life on earth, i.e. the original
> infrastructure. It is a component of key molecules such as nucleic
> acids, phospholipids, and AdenosineTriPhosphate, and, consequently,
> plants cannot grow without a reliable supply of this nutrient. All
> organisms that eat plants also need phosphorus and we are included in
> this. It happens to be a nutrient that can be lost from soils and once
> it is gone it must be replaced. That would normally be done by cycling
> ANIMAL manures (especially from insect eating birds, and humans) back
> into the soil. If your soil doesn't have enough you will need to provide
> it. *Get a soil test.* The continents are "leaking" what they should be
> conserving and this loss generates vast dead zones in our oceans. Its
> for this reason that I have supplemented rock phosphates in my own and
> client's gardens. So far it's still relatively cheap despite substantial
> price increases.
> (snips from http://www.energybulletin.net/49686)
> *Mobilizing phosphorus present in the soil *
> In many soils phosphorus is naturally present in sufficient amounts,
> however, it may be chemically locked up and not available for plants.
> Most of industrial agricultural soils in Western Europe and North
> America are oversupplied with huge amounts of superphosphate
> fertilizers, which results in binding phosphorus up with other elements
> so it ends up unused in the soil. In consequence, the concentration of
> phosphorus may be as high as 750 ppm, while only 45 ppm is necessary for
> growing grains . To determine whether you have a sufficient level of
> phosphorus in your soil, the surest way is to make a soil test. If the
> amount of phosphorus seems to be okay, but your plants show signs of
> phosphorus deficiency (purplish leaves, stunted stems), you may need
> help from a specially skilled team of phosphorus extractors -- fungi.
> Fungi are decay experts in soils. The enzymes that they secrete allow
> them to break up lignin, cellulose, chitin shells of insects and bones
> of animals, which are too difficult to digest for bacteria. A single
> teaspoon of a healthy soil may contain several meters of fungal hyphae,
> invisible to the naked eye. The optimum range for phosphorus uptake by
> plants is pH 6.0 -- 7.5, and on either side of this range phosphorus
> becomes immobile. A conventional approach would be to adjust pH by
> adding sulfur in alkaline soils or lime in acidic soils.
> There are many soils around the world that are naturally deficient in
> phosphorus, such as soils in the Amazon Basin, on Java or in Australia.
> Others have been damaged by inappropriate farming practices -- bare
> soils were flushed by rains, which washed away phosphorus, they were
> depleted by overharvesting of crops and their natural soil food webs
> were destroyed, making it impossible for plants to feed on anything
> other than artificial fertilizers. *While soil food webs can be
> restored, wherever there is not enough elemental phosphorus present, for
> any reason, it must be brought back by the farmer. The other option is
> to wait until mountain-generating processes raise the bottom of the sea,
> where phosphate fertilizers end up. When the new mountain ranges are
> formed, the rain will start to wash phosphorus out of the rocks, making
> it available for plants again. But this will take some time -- around
> 10-15 million years....
> *Superphosphate fertilizers are made from chemically treated phosphate
> rocks. They are not recommended for use as they are highly concentrated
> and reactive. When applied on the field they react with calcium, iron,
> magnesium and aluminum, creating within seconds compounds that make
> phosphorus unavailable for plants. They may react also with trace
> elements, locking them up and causing deficiencies of micronutrients.
> Superphosphates are water soluble and they can be easily washed away by
> rains before plants have a chance to assimilate them, which later may
> cause the eutrophication of lakes and rivers. Not to mention that high
> concentrations of phosphorus in fertilizers (above 10) are lethal to
> mycorrhizal fungi.
> Another material that is rich in phosphorus is guano -- bird or bat
> droppings. Bones of fish that are eaten by seabirds contain a lot of
> phosphates, and as a result seabird guano also contains a high level of
> phosphorus. Guano has accumulated over centuries on small islands on the
> Pacific Ocean or on the coast of Chile and Peru, where it was mined in
> such large quantities that its deposits are now severely depleted. In
> contrary to phosphate rocks, it is a renewable resource, however, only
> over a long period. Apart from phosphorus, guano also contains high
> levels of nitrogen and calcium. It can be fresh, semi-fossilized or
> fossilized, depending on the source.
> Phosphates can also be found in mud from ponds, in freshwater mussels,
> in fish waste, in algae or in recent volcanic ash. Many plants, such as
> comfrey, lupine, sweetclovers, nettle or vetches accumulate phosphorus
> and they can be used as green manure. Note, however, that they don't
> produce phosphorus in the way that nitrogen is fixed from the air by
> legumes. Rather, *they just extract phosphorus from one place and you
> can put it somewhere else, leaving the source with less phosphorus*.
> Bill Mollison: "Of all the elements of critical importance to plants,
> phosphorus is the least commonly found, and sources are rarely available
> locally. Of all the phosphate fertilizers used, Europe and North America
> consume 75% (and get least return from this input because of overuse,
> over-irrigation, and poor soil economy). If we really wanted to reduce
> world famine, the redirection of these surplus phosphates to the poor
> soils of Africa and India (or any other food-deficient area), would do
> it. Forget about miracle plants; we need global ethics for all such
> essential resources."
> It is possible to calculate a fair share of the remaining phosphate
> rocks for each country, depending on the soil's condition and number of
> population. And that's exactly what should be done. A global agreement
> is necessary for sharing the last phosphate rock reserves in a common
> sense way.
> Our current industrial agricultural system and the global economy that
> supports it are inherently unsustainable. Extracting a limited resource,
> such as phosphorus, and sending it to landfills or dumping it in the
> ocean doesn't make much sense. Sooner or later reserves of phosphate
> rocks will become depleted, then what? There is some back up in the form
> of deposits on the continental shelves and on seamounts in the Atlantic
> and Pacific Oceans, but the cost of mining it can be very high and even
> if industrial farmers were able to buy them, what about farmers from
> Botswana? What about farmers from Madagascar or India? What will be the
> cost of food, when the price of fertilizers goes up? Recycling
> phosphorus is just common sense and it seems inevitable, if we wish to
> continue living on Earth. It means that the exchange of our entire food
> supply and waste management systems is inevitable as well.
> Why wait till the industrial food supply system collapses from lack of
> phosphate fertilizers or because they are too expensive to buy? Farming
> the way nature does provides not only healthy soils and good yields, but
> also nutritious food, flavorsome food.
> If we manage to close the phosphorus cycle in our countries soon enough,
> we will have plenty of phosphate rocks left. We will be able to use them
> for restoring degraded lands, for planting trees, and greening our
> planet once again.
> Keith Johnson
> "Be fruitful and mulch apply."
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