Portia Phohlo

10 Questions 20 Answers 0 Followers

Questions related from Portia Phohlo

Is total water holding capacity at saturation the same as total porosity?

Can total porosity be deduced from the water holding at saturation? That is when soil is at saturation does that mean all pore spaces are filled with water? If this is true can one assume that the...

07 June 2021 2,598 10 View

Soil respiration: A relevant measure or just a nice idea?

Good day RG family Your insight would be greatly appreciated with regards to the above mentioned soil process. Please read further details on the attached...

24 April 2017 6,536 3 View

What could cause a significant decrease in total N levels in soil within a period of 2 years?

I have had numerous soil samples analysed from various farms with different soil types 2 years ago. The soil samples were analysed for Total N,C and other nutrients. I re-sampled the farms again...

12 July 2016 3,498 40 View

Is Chlorine a micro or macro element?

I have found the attached FAO report which classifies Cl as a macro element. All of the papers, case studies and reports that I have read previously classify Cl as a micro element. I would really...

15 April 2016 825 12 View

Is anaerobic N mineralization method a true reflection of PMN?

I have read many studies which use anaerobic incubation method to determine PMN. My understanding is that when soils are flooded with water, denitrification processes are enhanced because of lack...

06 April 2016 4,664 5 View

What is the solution for soils that have >7000mg/kg Al as well as >4000 mg/kg Ca?

I am at a stand still and require some assistance to find a possible solution for pasture based soils that are extremely high in both acidic and basic cations with water pH of 8 on av. The soils...

30 July 2015 6,303 10 View

Under what circumstances would a plant utilize Na+ instead of K+ in the closing and opening of the stomata?

I have read in an article that Na+ can be utilized in the guard cells in the place of K+ to control the closing and opening of the stomata. What soil or plant conditions would induce this...

11 May 2015 6,272 4 View

What are the desired base saturation levels for cations in soil?

I have read a lot of literature on base saturation but there are variations with regards to what percentages of Ca,K,Mg and Na are desired in soils. Does soil type and crop type have an influence...

27 March 2015 1,448 12 View

Hydrometer method vs Mid infrared method for soil texture

Is the hydrometer method for soil particle size analysis directly comparable with a mid-infrared method for the determination of clay percentage? I am worried about the 18 samples I have analysed...

01 January 1970 8,542 3 View

Which lab method is suitable for P extraction in acidic soils high in Al and Fe oxide?

Additionally, how to manage P fertilisation in such soils? Continuously apply P fertiliser even though there is a big chance it might be fixed by sesquioxides?

01 January 1970 3,874 8 View