Scioly.org

There are like 6 or 7 people that post here a lot, and then there are at least 50 people who ask "Does anyone know any specific things to study?". Should I feel inclined to know any of what is currently being disscussed? Because I feel really unprepared now.

2win wrote:Oh my gosh, thank you so much [for the answer]! My partner(AsllaPiscu) and I have been looking for that everywhere and we haven't been able to find it. Thank you sooooooo much!
But now, does anybody have anything on "digesting soil with stron acid"?

No problem! I was looking fr that for quite a while myself

I;m also looking for an explanation of digested soil samples and why people do that.. If anyone has a answer please post it!

I think it's for testing metal content in the soil.

Thanks.. ok last thing.

This sounds kind of dumb, but what are the chemical formulas of N-P-K.. like for nitrogen is the formula simply N? It seems to me that that would be too simple.. Are their more complicated chemical formulas that I am missing?

K is found as Potash, either K2OH or KO2. Either are acceptable formulae. N is either in NO3 or NH4, im not sure which one for fertilizer, and P is in PO4.

oh thank you- so glad to get that cleared up!! i felt like i was missing something obvious!

gneissisnice wrote:K is found as Potash, either K2OH or KO2. Either are acceptable formulae. N is either in NO3 or NH4, im not sure which one for fertilizer, and P is in PO4.

I may be wrong, but I thought that P was P2O5?

idk maybe there are multiple? i will make a note of both!!

has anyone had to test to find the amounts of nitrogen, phosphorous, potassium, or other nutrients from a soil sample??.. if so how did you find them? im sure there is a probe that could be connected to a graphing calculator for this purpose, but from what i've been reading, most competitions haven't been giving graphing calculators, and are asking kids to find other ways to do this??

2win wrote:

gneissisnice wrote:K is found as Potash, either K2OH or KO2. Either are acceptable formulae. N is either in NO3 or NH4, im not sure which one for fertilizer, and P is in PO4.

I may be wrong, but I thought that P was P2O5?

I think when they refer to fertilizers (N-P-K), the N is plain N, P is the form P2O5, and the K is the form K20. The bioavailable forms of N are NO3- and NH4+, for P is PO4(3-) (or, the unprotonated forms as well, i think, can someone confirm?-- HPO4(2-) AND H2PO4-) and for K is just the K+ ion.

Yeah, the reported percentages N-P-K are the percentage of elemental nitrogen (N), phosphorus pentoxide (P2O5), and potassium oxide (K2O). The nitrogen is usually either in the form of ammonium nitrate (NH4NO3) or urea ((NH2)2CO), though.