Determination of 't' and 'z' of Smythies Safeguarding Formula to Regulate Yield of Boswellia serrata in Daltonganj South Forest Division of Bihar

A precise estimate of parameters 't' and 'z' I e., the time taken to pass from class II to class I and the mortality per cent during this period respectively is needed to regulate yield according to Snythies Safeguarding Formula. No scientific estimate of 't' and 'z' for salai (Boswellia serrata) tree is available in Bihar. This paper specifies a quadratic regression equation between DBH and five-yearly increment in DBH, generates an 'age-diameter' table and estimates 't'= 30 years and 'z'=9% for salai trees in Daltonganj South Division of Bihar.