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-->Phosphate is a major nutrient.

It is taken as H2PO3(-) or HPO3(2-) anions, the form varies with soil pH.

The 6th most common element in plant by mass. Has major functions in cell energy metabolism and nucleic acids.

Commercial nutrient number one.

The biggest issue in managing phosphate concentration in soil solution is its strong affinity to absorb into iron and aluminium oxidesand hydroxides. Changing the buffered phosphate concentration in soil solution takes a lot of phosphate added to soil by fertilisation over many years.

Agricultural soils contain huge amounts of phosphate unavailabe to plant life but if moved by erosion into bigger pools of water the soil particles saturated with phosphate will release the huge amounts P they possess into water bodies and cause eutrophia.

The Baltic Sea is an example of too much phosphate in wrong place.<!--
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-->Plant takes all its carbon from air as carbondioxide and then reduces it in the photosynthesis reaction and makes into sugars and so on.

Carbon makes the major part of the dry mass of all living beings.

Carbon, Oxygen and Hydrogen make >90% of a plants biomass.


Even the coal and oil industries like CO2 -> http://www.plantsneedco2.org

I hope you realise that CO2 is also a green house gas and its warming effect is very real and simple understand.

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-->Chlorine exists in nature as Chloride anion, Cl(-). Very minor nutrient.

It was hard to determine whether chloride was necessary for the life cycle of plants as it is needed very very little and even air has that amount of chloride in it.

The final success was in an air tight green house experiment where all incoming air was carefully filtered. Even there the first generation of test plants from natural seeds showed no signs of chloride deficiency.

The second generation born from the firsts seeds finally proved chloride's necessity for plant life as they couldn't sprout.


Don't know if the story is too chemistry geeky to understand but the point is that there's pretty much everything everywhere in miniscule amounts.

Or something.<!--
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<table border="solid" bordercolor="black" RULES=NONE FRAME=border bgcolor="#000000"><tr><td align="center" bgcolor="#003300"><font color="FF9900">A NH4(+) cation, usable to plants although nitrate NO3(-) form of nitrogen is preferred.

The most abundant element in plants after carbon, oxygen and hydrogen.


We have hugely altered the "natural" nitrogen cycles of the world by the invention and using of the Haber-Bosch process to fix N2 from atmoshpere to NH3 by using energy and H2 from fossilic fuels. This alteration basicly made it possible to increase human population to it current numbers.



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<table width="500px" border="solid" bordercolor="black" RULES=NONE FRAME=border bgcolor="#000000"><tr><td align="center" bgcolor="#003300"><font color="FF9900">A plant uses O2 same way animals do: As electron acceptor when oxidicing carbohydrates.

Most anionic forms of nutrients are oxyanions too.

Just as nice to know fact, oxygen is the most common element(by mass) on earth. About half of earth is oxygen, there's also some oxygen in the atmosphere.

Oxygen is bioactive by gaseous elemental O2 and in many oxyanions and organic compounds.

<table border="solid" bordercolor="black" RULES=NONE FRAME=border bgcolor="#000000"><tr><td align="center" bgcolor="#003300"><font color="FF9900">A plant takes iron in as Fe3+ or Fe2+ cation and uses it as Fe2+.</font></td></tr></td></tr><!--
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<table border="solid" bordercolor="black" RULES=NONE FRAME=border bgcolor="#000000"><tr><td align="center" bgcolor="#003300"><font color="FF9900">Mg(2+) is the activator cation of all Chlorophyll-enzymes so NO photosynthesis is possible without Magnesium</font></td></tr></td></tr><!--
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Major nutrient. Taken as sulfate anion.

The 7th most common element in plant by mass. Essential part of some amino acids, present also in some volatile organic compounds emitted by plants.

Sulfate defiencies in agricultural use of soils are again rising as sulfur emissions from industrial sources has greatly lessened.

(Which of course is a good thing considering that sulfur oxides released from burning becomes sulfuric acid in air we breathe and in soil too and acidification by sulfuric acid fallout is bad and with less acidic fallout the less liming is needed and so on.)

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-->The Calcium cation has charge of +2.

Major nutrient and an earth alkali metal.<!--
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Taken as Zn(2+).

Heavy metal and trace element.

Defiecency in animals weakens their ability to breed.

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-->Very minor nutrient. Exists in nature as an anion with charge of -1.

Chloride is present everywhere in miniscule amounts. It was hard to determine whether it was necessary for the life cycle of plants as it is needed very very little and even air has that amount of chloride in it.

The final success was in air tight green house experiment where all incoming air was carefully filtered. Even there the first generation of test plants from natural seeds showed no signs of chloride deficiency.

The second generation born from the first's seeds finally proved chloride's necessity for plant life as they couldn't sprout.


Don't know if the story is too chemistry geeky to understand but the point is that there's atleast miniature amount of chloride hanging around everywhere.

Or something.<!--
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