Thanks. I have not worked on this aspect

There ar e some specific apps, but intro refs and matters in Clark's  http://onlinelibrary.wiley.com/doi/10.1017/S1350482702001093/pdf can be a start.

Clark paper is a possible start with valuable apps. The relationship with actual values depends on permeability, cropping and soil structure, http://onlinelibrary.wiley.com/doi/10.1017/S1350482702001093/pd

Thank you Dr.Raj and Pr.Bongi. I am sure those papers are very helpful

There is an article was puplished in the nature copyright that can illustrating and defining that term to you in easy way . The article is:

Nature 176, 1276 (31 December 1955); doi:10.1038/1761276a0

An Instrument for measuring Soil-Moisture Deficit

G. STANHILL & E. J. WINTER

National Vegetable Research Station, Wellesbourne, Warwick. Aug. 17.

THE estimation of residual available soil moisture should be an essential part of irrigation practice. Penman's method1, based on meteorological observations, gives excellent results; but in its present form it is somewhat cumbersome for use by commercial growers. Various alternative methods are available; for example, measured evaporation from an open water surface may be expressed as potential evapo-transpiration by means of a suitable conversion factor1. Garnier has measured evapo-transpiration directly using a standard grass surface2. There is, however, a need for a simple device which will integrate rainfall and evaporation measurements and give a reading expressed as soil-moisture deficit.

Penman, H. L. , Proc. Roy. Soc., A, 193, 120 (1948). | ISI |

Garnier, B. J. , Nature, 170, 286 (1952). | PubMed | ISI | ChemPort |

© 1955 Nature Publishing Group

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http://www.nature.com/nature/journal/u/n4496/abs/1761276a0.html

http://www.nature.com/nature/journal/v176/n4496/abs/1761276a0.html

Thank you Dr.Alasfoor. Do you have a copy of that paper?

https://www.researchgate.net/publication/249606125_The_Crop_Moisture_Index_Unnatural_Response_to_Changes_in_Temperature?ev=prf_pub

Article The Crop Moisture Index: Unnatural Response to Changes in Temperature

Thank you Dr. Kornfield