Yes, you can use the RootTrace software to do that!

https://www.cpib.ac.uk/tools-resources/software/roottrace/

You can use Image Tool, new version for Windows 8 is called CMEIAS. It's easy to use and free! If you need some help to use it, tell me. I can help you!

 Dear all, Thanks a lot for your advice and I get many options. Afterward practicing them, I will share my advice on them. Regards 

Guess that showelomics and any statistical software would de adequate as in Plant and soil report by http://scholar.google.it/scholar_url?url=http://www.researchgate.net/profile/Jonathan_Lynch/publication/225498329_Shovelomics_high_throughput_phenotyping_of_maize_%28Zea_mays_L.%29_root_architecture_in_the_field/links/09e415097c1b1c32bd000000.pdf&hl=en&sa=X&scisig=AAGBfm0b3BaEt-hHKamwbsgrAdsNm5D4Cg&nossl=1&oi=scholarr&ei=9XorVfbCEOP9ygPQ7YHwAw&ved=0CCEQgAMoATAA

Of course much more detailed information is availòable searching for plant architecture and rendering tools, following H. Sinoquet or 3-D digitizers, but for many purposes the amis procedure is a relaible reference

Article Shovelomics: High throughput phenotyping of maize (Zea mays ...

 Mr. Bongi, thanks for your contribution. This is great for maize crop, but in case of wheat or other small roots crops, its difficult.

Regards

Dr. Regani, thanks for advice and I already have the software, and little information from the web.

Can you summarize how to perform root analyzing step by step please.

Regards

Fathi 

Although it is not a free software but I think, quite a nice program: http://www.regentinstruments.com/assets/winrhizo_about.html

Best regards

Marian

As far I know In wheat the angle is between the first pair of seminal roots. This is usually observed in small root boxes and then tested in vivo for yield. as in Glenn McDonald report at http://regional.org.au/au/asa/2010/crop-production/soil-water/7076_mcdonaldg.htm.  I wonder if this could be done in the field, with  best regards