Stone
Well-Known Member
Given that the loss of Sulphate-S from containers is in direct proportion to the amount of water leaving the pot (sulphate being an anion), I think it is safe to assume that in some cases the leaching of S from pots may be too much unless there is a continuous supply.
Also, considering that many plants use as much S as they do Phosphorus I believe that some ferts are not providing enough.
I wonder if the greening of plants sprayed with Mg sulphate are showing a response to the S as much as the Mg in many cases. Remembering that the Mg is held much more in the media than the S.
If we are using very pure water and water a lot, perhaps we need to consider supplementing S in some way.
I have gone back to adding a sprinkling of crushed rock gypsum to the top of pots as well as a little (as fine powder) to the irrigation water.
I am pretty sure I have observed some greening.
It is suggested that S should be around 1/8 of the N. 95% of the SO4 in the soil comes from decomposed organic material (the kind of stuff Paph roots grow in)
Has anyone else considered this?
Also, considering that many plants use as much S as they do Phosphorus I believe that some ferts are not providing enough.
I wonder if the greening of plants sprayed with Mg sulphate are showing a response to the S as much as the Mg in many cases. Remembering that the Mg is held much more in the media than the S.
If we are using very pure water and water a lot, perhaps we need to consider supplementing S in some way.
I have gone back to adding a sprinkling of crushed rock gypsum to the top of pots as well as a little (as fine powder) to the irrigation water.
I am pretty sure I have observed some greening.
It is suggested that S should be around 1/8 of the N. 95% of the SO4 in the soil comes from decomposed organic material (the kind of stuff Paph roots grow in)
Has anyone else considered this?