Nguyen Hue

9 Questions 19 Answers 0 Followers

Questions related from Nguyen Hue

Role of organic P in soil and plant nutrition?

It has been reported that organic P can be as high as 70% of the total P in soils. And if we fertilize with animal manure or compost, we add a lot of organic P. How can we estimate how fast and...

28 April 2017 8,651 19 View

Can silicate reduce arsenic toxicity in plant under aerobic conditions?

We know that arsenate (H2AsO4 and HAsO4) can compete with phosphate, and arsenite As(OH)3 can be taken up similar to soluble silica (Si(OH)4). However, can silicate (normally Si(OH)4 at pH 3-9)...

02 March 2016 2,393 3 View

What is the effective way to measure the real cation exchange capacity (CEC) of biochars?

Biochars are thought of as 'inert' carbon materials, yet their reported CEC are relative high (over 20 centimole of charge per kg). Are these values correct? or the methods of measurement are not...

13 October 2015 8,919 5 View

Does water extract from compost (compost tea) increase plant growth and suppress diseases?

One of cultural practices in organic farming is to spray vegetable crops with compost tea. It is believed that compost tea would provide plant nutrients, stimulate growth (via growth hormones in...

03 February 2015 6,499 8 View

What are reliable criteria for identification of Al toxicity in an acid soil?

Aluminum (Al) toxicity is a serious constraint to crop production in many regions around the world. The first step in correcting this problem is to identify it. Should we use exchangeable...

29 November 2014 882 18 View

How useful is the organic matter as measured by loss on ignition at 300 oC?

Organic matter can be estimated quickly and rather easily by burning a soil sample at 300 oC in a furnace for 4-6 hours. How well correlated is such a value with soil organic carbon as measured by...

17 September 2014 7,997 6 View

Would arsenic (As) uptake by Chinese brake fern (Pteris vittata) be increased or decreased if a high-As Oxisol is amended with a high-P compost?

As we know, As and P can compete with each other for soil adsorption as well as for plant uptake. How can we predict As phyto-availability upon fertilization with a P source?

09 September 2014 787 3 View

Could arsenic and aluminum have hormetic effects on plants?

As most agronomists and soil scientists know, Al and As are considered toxic to nearly all crops. Yet, at very low concentrations (part per billion in soil solution) could these two elements...

02 September 2014 1,356 3 View

What causes high CEC in biochars?

Biochars are thought to be a very stable form of carbon, yet normal CEC measurement (e.g., Neutral 1 M ammonium acetate) would yield very high CEC values (ranging from 15 - 40 cmolc/kg). Where are...

31 August 2014 3,234 13 View