There are important distinctions to be made regarding the exact concerns of each of those interest groups. Most of the work I am familiar with is concerned with the maximum water availability for uptake by plants, so these papers gives a quick overview- http://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_053288.pdf , http://www.sugarresearch.com.au/icms_docs/164426_Soil_water_holding_capacity_IS13107.pdf , and http://www.icrisat.org/what-we-do/learning-opportunities/lsu-pdfs/Soil%20Moisture%20Calculation.pdf 

Additionally, full understanding of the materials provided at http://www.soils.usda.gov/wps/portal/nrcs/detail/soils/ref/?cid=nrcs142p2_054241 will take you a good way down that road.

We commonly refer to the parameters by Carsel and Parrish (1988) and use them in the pedo-tranfer functions after van Genuchten and Mualem. With this, you can basically determine any hydraulic (diffusive) property of a homogeneous porous medium.

Carsel and Parrish (1988): http://dx.doi.org/10.1029/WR024i005p00755

Standard parameters attached.

As plant available water can be deduced from field capacity and wilting point, pedotransfer functions may be useful for your purpose. http://pubs.aic.ca/doi/abs/10.4141/CJSS07120 provides pedotransfer functions for these points depending on texture and OM and lists other studies on the topic.

There may not be appropriate value of FC/AWC for type of soil as this factor is time domain. For a real time dataset you may have to use soil moisture equipment's to monitor FC and AWC. Arbitrary vales can be obtained from literature pertaining to Journals on Soil Science   

THANK YOU VERY MUCH SIR FOR YOUR GUIDANCE.COULD YOU SUGGEST SOME LIGHT WEIGHTED REFERENCE ON THIS TOPIC

You may to look for Indian Soil Science Journal, Journal by Maharastra Agricultural University, MASU (Madras Agricultural Students Union) Journal and NBSS&LUP Reports. In case of further information contact my email id