What determines pH of biochars?

Most biochars have alkaline pH (above 8). That could be explained by Ca, Mg, K oxides released during the charring process (pyrolysis). Yet, some biochars have acidic pH (less than 6). What may be...

05 June 2018 2,324 5 View

Where does positive charge on biochar come from?

It has been reported that biochars can retain anions, such as nitrate and phosphate. Specific adsorption could explain P retention, but positive charge must be present to electrostatically retain...

01 February 2018 6,146 1 View

Are there minimum numbers of variables and observations in Principal Component Analysis (PCA)?

It is understood that PCA can be used to combine/reduce rather large numbers of related variables into a few independent (orthogonal) factors for statistical analysis and interpretation. Yet, are...

07 August 2017 2,424 1 View

Can I use a pressure cooker to sterilize soils? If yes, what precautions should I take?

I need to sterilize about 100 kg soil for a greenhouse experiment. Knowing that methyl bromide has been banned and sodium azide or toluene is not appropriate (because I want to study N and C), is...

04 May 2016 326 2 View

How to separate abiotic from biotic effects of biochar on soil quality?

We know that biochars have several properties from tiny pores that can retain water and protect microorganisms to surface functional groups (e.g., COOH, OH, C=O, etc) that can retain plant...

04 May 2016 4,806 4 View

How can we match biochars -- as soil amendments -- with soil conditions?

Since different biochars have different properties, what kind of biochars should be used as a soil amendment for nutrient-poor, acidic tropical soils? The goal is to improve soil productivity and...

04 May 2016 669 4 View

How well can we characterize ferrihydrite and allophane now?

Decades ago ferrihydrite and allophane were considered amorphous with no X-ray patterns. But now with modern techniques, Can we characterize these minerals (substances) well?

11 December 2015 3,026 0 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...

09 October 2015 2,068 6 View

How to control eutrophication?

Eutrophication is a serious problem in many water ways from China to the US gulf coast. It is believed to be caused by high P and N from erosion and run-off. Are there any good ways to control it?

04 May 2015 5,857 2 View

How valuable is h-index?

h-index is sometimes listed as a measure of research/citation (quality). How meaningful is it? and what is the expected h-index of a newly-hired assistant professor?

02 March 2015 4,473 7 View

How UAV or drone can be beneficial to better estimate crop yield?

As we know, crop yield estimation has been done traditionally with farmer's expert knowledge, deductive sampling in representative areas, and remote sensing with satellite imagery. Farmer's Expert...

01 March 2021 3,468 3 View

Timeout error!! Processor in the loop (PIL) using STM32F4 Matlab 2018a?

Dear Researchers I am trying to perform a PIL simulation using STM32F4 Discovery board and comunication serial USB TO TTL. During simulation I receive the following timeout error: An error...

01 March 2021 2,327 1 View

Analysis of CRD two factor using R studio ?

Hello everyone. I have conducted the research on post harvest longevity of tomato crop using plastic packaging and different doses of chemicals as two different factors. The design of experiment I...

28 February 2021 8,189 3 View

Is Journal of Agricultural Research a predator?

it is published by Juniper

28 February 2021 354 4 View

Where i will get the Desmodium and Napier grass seeds?

26 February 2021 975 4 View

No title

I am trying to find how to know the density needed for a pva electrospinning in a 0.6mm neddle, the electrospinning will be from top to bottom and the problem I really have is the solution because...

25 February 2021 2,615 3 View

How Can I clain a removal of a co-author?

I would like to make a correction in a co-author in your paper which is wrong. This name is also in other papers of Kenton Ko. Zey Ko is not a Co-author . The correct name is Zdenka...

24 February 2021 3,476 4 View

How does the injection volume impact LLOQ and ULOQ in regression analysis (LC-MSMS)?

Hello, I have run into an issue that has sparkled a debate at work: is the LLOQ/ULOQ impacted by injection volume under the following circumstances: 1) Same dilution factor of all samples 2)...

23 February 2021 9,159 3 View

Difficulty in debugging code to correct error - TypeError: '<' not supported ?

I am trying with a Unet code ontained from net ...in tensorflow. When trying to predict the segmentation result with the trained and saved model with metric " iou" using "CustomObjectScope"...

22 February 2021 5,254 1 View

How to perform Haldane correction on SPSS?

I was wondering if anyone knew how to perform the Haldane correction for SPSS (this is the definition of the correction -...

21 February 2021 2,882 1 View