@ Aown, I think it is not possible. Even in sand dunes, where more than 95% of the particles are sand, we are getting more than 5 ppm of P and K under any soil condition.
@ Aown, yes, I agree with Tarafdar Sir.
Zero P or K is not possible.
@Tarafdar, As we know in highly acidic soil, phosphorus reacts with iron and aluminum and in alkaline soil, phosphorus reacts with calcium
That makes it unavailable to plants.
It is impossible because at acidic pH fixed phosphorus/non-labile phosphorus like iron and aluminium bound P will be there
Yes. I agree with others. The said situation is not possible in our environment.
In extremely acidic soil, phosphorus availability may be very less, but that does not mean soil does not have any phosphorus. Most of the phosphorus in acidic soil is just bound with the Al an Fe oxides and hydroxides and are precipitated out from the soil solution, that being said it becomes unavailable to plants. However, total phosphorus analysis after digesting soil with reagents will give you the actual scenario.
For potassium, in acid soil there will be competition between H+ and K+ for exchange sites, increasing potassium concentration in soil solution and bio-availability to plants. This also increases the chance of leaching out from soil.
Por experiencia puedo decir que el pH de los suelos agrícolas varían entre 3.5 ( suelos tropicales )hasta 10 en la zona de Villacuri Ica ,que tenia cerca de 65 % de PSI, siendo suelos arenosos .ahora son agrícolas, sembrados con vid, por lógica creo firmemente que no hay suelos con pH cerca a cero.
No, zero phosphorus is impossible, but yes, by decreasing the soil pH the phosphorus content also decreases
Perhaps it is a hypothetical question. The level of soil organic carbon is to be estimated before arriving at a conclusion. I would like to cite a few examples. The acidic soils of Darjeeling hills were rich in phosphorus as well as soil organic carbon. Similarly, the acidic soils of the western coastal plains- a case study of Goa were rich in organic carbon as well as phosphorus. Thus besides the chemical reaction between Al and phosphorus, the chemical interaction between Al and organics is to be studied before drawing a conclusion.
It is not possible to have around zero pH of soil. At zero pH the p availability is decreases because it is fixed by iron and aluminium and silicate minerals. But we analyse the soil samples for total p we found that P is found in this soil but it is converted to unavailable form
And k availability is increase due to compitition between k and H .......
Please share your experience, if any of such paradoxical situation with us. It will help us to expand our knowledge base.
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