CONSTRUCTION AND VALIDATION OF TREE VOLUME FUNCTIONS FOR <em>DALBERGIA</em> <em>SISSOO</em> GROWN UNDER IRRIGATED CONDITIONS IN THE HOT DESERT OF INDIA

Abstract

Six volume equations were compared on the basis of fit and validation statistics using data collected from Dalbergia sissoo stands at Indira Gandhi Nahar
Pariyojana (IGNP) area of Rajasthan State in India. An equation fitting very well to a data set may not necessarily be the best when applied to another data set though collected from the same population. The contrasting results obtained sometimes between model fitting and validation emphasise the need for model validation as an important step in model construction process in order to get the best choice. The combined variable equation produced the best results and hence has been recommended for use in total wood volume prediction of D. sissoo in the study area.