How to know that 14%, 16% and 18% water contents produce how much osmotic potential in soil? and how much concentration of PEG 6000 would generate such OP in Hoagland solution ?
Calculation of PEG concentration to produce desired OP in solution can be done using an empirical formula (ready to use MS Excel sheet also available online), which had been already addressed in a previous question in RG (link below).
https://www.researchgate.net/post/How_can_I_prepare_a_PEG_8_000_solution_with_defined_osmotic_potential
Have no idea about any such relationship for calculation of PEG concentration to produce desired OP in soil. In case of soils, texture is the most important factor determining the OP at same soil moisture content. The variation in OP is the maximum in the moisture content range of 10 to 25% for different textures. Besides, PEGs are highly contaminated by P and Al, and are also reported for plant uptake. Thus, it may require small calibration experiments to evaluate PEG concentrations at different soil moisture content on OP of soil.
Thank you so much for prompt reply. @Respected Nilay Borah
First, i have downloaded file that calculate OP, which had been already addressed in a previous question. but the amount calculated seems to be low when i put a PEG values , (totally different OP values as described in any paper ) for example in one paper it is mentioned that 10 % PEG 6000 corresponds (–0.2 MPa) osmotic potential. but putting 10 % PEG 6000 value in downloaded file it shows -0.14 OP. and value shows high difference, when we increase the PEG concentrations.
Second, i asked that and how much concentration of PEG 6000 would generate such OP in Hoagland solution ? not in soil.
There is two part of the question.
1. 14%, 16% and 18% water contents produce how much osmotic potential in soil?
2. And such OP for 14%, 16% and 18% would be generated by how much PEG 6000 concentration in Hoagland solution ?
The osmotic pressure of PEO against a soil solution depends on the composition of the soil solution and the temperature. The maximum possible osmotic pressure is the pressure against our water, see the added figure.
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