000			01331nam a2200205Ia 4500
008			220216s9999 xx 000 0 und d
100			_aWijesuriya W
245		0	_aSmaple size for estimation of girth in immature rubber holdings
260			_bJournal of the National Institute of Plantation Management _c2001
300			_a60-67
520			_aDetermination of the sample size for accurate estimation of girth records is a basic necessity in sampling plans. This study was focused on the above objective and analyses were carried out using secondary data on girth, obtained from immature rubber holdings covering seven rubber growing districts. The coefficients of variation (CV) gor girth were calculated for each rubber holding and averaged accordingly, to study the change in CV (i) with age (ii) in different districts (iii) with the varying extents (iv) with the type of clone (v) with the type of planting material, and (vi) with the stand per ha. in a rubber holding. Subsequently, a sampling guide is proposed based on the average CV for varying conditions and the accuracy needed on the estimation of girth.
650			_aGirth
650			_aImmature rubber
700			_aAbeywardene V
700			_aDissanayake D M A P
700			_aPuhambugoda R
700			_aYoharatnam N
856			_uReprint
942			_cJS
999			_c68779 _d68779