soil ph information

[iqbalhabibie habibie]

Dear all member,

I am new with soil and still need to learn. I am looking for soil ph data and I got soil ph information from soilgrids.org website and I downloaded for my soil ph but there is 2 information PHIHOX and PHIKCL. I have some location of soil pH in H2O and KCL for example area :

https://rest.soilgrids.org/query?lon=111.099692&lat=-8.195569&attributes=PHIHOX

https://rest.soilgrids.org/query?lon=111.099692&lat=-8.195569&attributes=PHIKCL

I have some question :

1). what is the differences between these two types of soil ph? 

2). which is appropriate for my country in Indonesia? 

3). Also, I have a couple point of my study area do I need overlay the points like this information this groups information: https://groups.google.com/forum/#!searchin/global-soil-information/soil$20ph|sort:date/global-soil-information/GlX11FNl0p0/5XoRchwKDAAJ

4). I also read the paper : http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0169748, I would like to ask soil profile derived from MODIS land products, which type MODIS should I download? Thank you

best regards

Iqbal Habibie

[iqbalhabibie habibie]

For number 2 questions means which is appropriate soil pH for growing crops because I read that soil pH range from 5.5 to 7.5 is optimal for growing crops (https://soilmapper.org). So I conclude that PHIHOX is suitable? Please suggest me if I'm wrong. Thank you. 

best regards

Iqbal Habibie

[Jorge de Jesus]

Dear  Iqbal

1. ph versus kcl

The difference is basically  the water solution that you use to measure your ph, the PHIHOX means that you used plain water added to the soil ample and then you measure the pH, while PHIKCL means that instead of plain water it was used a KCL solution

give a look at this discussion

https://www.researchgate.net/post/Which_are_the_best_methods_for_the_measurement_of_soil_pH

2. which is appropried

It depends what analysis are you doing, I understood that you are doing crop analysis and will give you an answer as agronomist (I am not a soil sciencist), but PHIKCL beter represents the acidity of soil that crop will respond to, it is a more realistic soil situation, and take more into consideration of PHKCL values

3. Overlay

You need to download the point data from the REST as indicated on the link that you posted  on this point, give it a better look and also to the R package http://gsif.r-forge.r-project.org/REST.SoilGrids.html

4. MODIS

@Luis, @Laura ?

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[muhammad Iqbal Habibie]

Dear Jorge de Jesus,

Thanks man for great explanation. I will study some more. I read from the paper http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0169748, or your team built SoilGrids 250m using MODIS 250m(perhaps), is it possible to upscaling to 30m or 10m? (just wondering). Thank you

best regards

Muhammad Iqbal Habibie

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[Luis de Sousa]

Dear Iqbal,

the PlosOne article lists the covariates that were used in the 2017 release of SoilGrids. It may be technically possible to map soil properties at higher spatial resolution(s), however, it might not be statistically sensible to do so if your observations are not spatially dense enough.

Best regards.

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________________________________________
From: global-soil...@googlegroups.com <global-soil...@googlegroups.com> on behalf of muhammad Iqbal Habibie <iqbalhab...@gmail.com>
Sent: 11 July 2019 10:30:06
To: SoilGrids Community Forum
Subject: Re: soil ph information

Dear Jorge de Jesus,

Thanks man for great explanation. I will study some more. I read from the paper http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0169748<http://www.google.com/url?q=http%3A%2F%2Fjournals.plos.org%2Fplosone%2Farticle%3Fid%3D10.1371%2Fjournal.pone.0169748&sa=D&sntz=1&usg=AFQjCNGnHIXAh0WxHjHU9b7EOtegF518yw>, or your team built SoilGrids 250m using MODIS 250m(perhaps), is it possible to upscaling to 30m or 10m? (just wondering). Thank you

best regards
Muhammad Iqbal Habibie


On Thursday, July 11, 2019 at 5:01:25 PM UTC+9, Jorge de Jesus wrote:
Dear Iqbal

1. ph versus kcl

The difference is basically the water solution that you use to measure your ph, the PHIHOX means that you used plain water added to the soil ample and then you measure the pH, while PHIKCL means that instead of plain water it was used a KCL solution
give a look at this discussion
https://www.researchgate.net/post/Which_are_the_best_methods_for_the_measurement_of_soil_pH

2. which is appropried

It depends what analysis are you doing, I understood that you are doing crop analysis and will give you an answer as agronomist (I am not a soil sciencist), but PHIKCL beter represents the acidity of soil that crop will respond to, it is a more realistic soil situation, and take more into consideration of PHKCL values

3. Overlay
You need to download the point data from the REST as indicated on the link that you posted on this point, give it a better look and also to the R package http://gsif.r-forge.r-project.org/REST.SoilGrids.html

4. MODIS

@Luis, @Laura ?

On Thu, Jul 11, 2019 at 3:58 AM iqbalhabibie habibie <iqbalhab...@gmail.com<javascript:>> wrote:
Dear all member,

I am new with soil and still need to learn. I am looking for soil ph data and I got soil ph information from soilgrids.org<http://soilgrids.org> website and I downloaded for my soil ph but there is 2 information PHIHOX and PHIKCL. I have some location of soil pH in H2O and KCL for example area :

https://rest.soilgrids.org/query?lon=111.099692&lat=-8.195569&attributes=PHIHOX
https://rest.soilgrids.org/query?lon=111.099692&lat=-8.195569&attributes=PHIKCL

I have some question :

1). what is the differences between these two types of soil ph?
2). which is appropriate for my country in Indonesia?

3). Also, I have a couple point of my study area do I need overlay the points like this information this groups information: https://groups.google.com/forum/#!searchin/global-soil-information/soil$20ph|sort:date/global-soil-information/GlX11FNl0p0/5XoRchwKDAAJ<https://groups.google.com/forum/#!searchin/global-soil-information/soil$20ph%7Csort:date/global-soil-information/GlX11FNl0p0/5XoRchwKDAAJ>
4). I also read the paper : http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0169748<http://www.google.com/url?q=http%3A%2F%2Fjournals.plos.org%2Fplosone%2Farticle%3Fid%3D10.1371%2Fjournal.pone.0169748&sa=D&sntz=1&usg=AFQjCNGnHIXAh0WxHjHU9b7EOtegF518yw>, I would like to ask soil profile derived from MODIS land products, which type MODIS should I download? Thank you

best regards
Iqbal Habibie




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[iqbalhab...@gmail.com]

Dear  Luís Moreira de Sousa and  jorge,

I am trying again using rest api (https://rest.soilgrids.org/query?lon=111.099692&lat=-8.195569&attributes=PHIHOX), but seems different this year. (can be seen in attachment). I am trying to access and gain the PHIHOX and other layers too so there is alternative using  from this website : 

https://rest.soilgrids.org/soilgrids/v2.0/docs#/default/query_layer_properties_properties_query_get, but from this the values show null :

{"type":"Feature","geometry":{"type":"Point","coordinates":[111.099692,-8.195569]},"properties":{"layers":[{"name":"bdod","unit_measure":{"d_factor":100,"mapped_units":"cg/cm³","target_units":"kg/dm³","uncertainty_unit":""},"depths":[{"range":{"top_depth":0,"bottom_depth":5,"unit_depth":"cm"},"label":"0-5cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":5,"bottom_depth":15,"unit_depth":"cm"},"label":"5-15cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":15,"bottom_depth":30,"unit_depth":"cm"},"label":"15-30cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":30,"bottom_depth":60,"unit_depth":"cm"},"label":"30-60cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":60,"bottom_depth":100,"unit_depth":"cm"},"label":"60-100cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":100,"bottom_depth":200,"unit_depth":"cm"},"label":"100-200cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}}]},{"name":"cec","unit_measure":{"d_factor":10,"mapped_units":"mmol(c)/kg","target_units":"cmol(c)/kg","uncertainty_unit":""},"depths":[{"range":{"top_depth":0,"bottom_depth":5,"unit_depth":"cm"},"label":"0-5cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":5,"bottom_depth":15,"unit_depth":"cm"},"label":"5-15cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":15,"bottom_depth":30,"unit_depth":"cm"},"label":"15-30cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":30,"bottom_depth":60,"unit_depth":"cm"},"label":"30-60cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":60,"bottom_depth":100,"unit_depth":"cm"},"label":"60-100cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":100,"bottom_depth":200,"unit_depth":"cm"},"label":"100-200cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}}]},{"name":"cfvo","unit_measure":{"d_factor":10,"mapped_units":"cm³/dm³","target_units":"cm³/100cm³","uncertainty_unit":""},"depths":[{"range":{"top_depth":0,"bottom_depth":5,"unit_depth":"cm"},"label":"0-5cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":5,"bottom_depth":15,"unit_depth":"cm"},"label":"5-15cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":15,"bottom_depth":30,"unit_depth":"cm"},"label":"15-30cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":30,"bottom_depth":60,"unit_depth":"cm"},"label":"30-60cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":60,"bottom_depth":100,"unit_depth":"cm"},"label":"60-100cm","values":{"Q0.05":null,"Q0.5":null,"Q0.95":null,"mean":null,"uncertainty":null}},{"range":{"top_depth":100,"bottom_depth":200,"unit_depth":"cm"},"label":"100-200cm","values":  

and I cant use using R language :

## Not run: library(rjson) library(sp) 

## 2 points: 

pnts <- data.frame(lon=c(10.65,5.36), lat=c(51.81,51.48), id=c("p1","p2")) 

coordinates(pnts) <- ~lon+lat 

proj4string(pnts) <- CRS("+proj=longlat +datum=WGS84") 

pnts 

## REST example: 

soilgrids.r <- REST.SoilGrids(c("ORCDRC","PHIHOX")) 

ov <- over(soilgrids.r, pnts) str(ov)  

from this I have some difficulties accesing and an error from the executing  this command : soilgrids.r <- REST.SoilGrids(c("ORCDRC","PHIHOX")) 

Error in REST.SoilGrids(c("ORCDRC", "PHIHOX")) : 

  could not find function "REST.SoilGrids"

Any solution for this problem? Thank you very much.