In order to investigation the diameter increment of maple tree (Acer velutinum Boiss.) plantations in Mazandaran province , 4.9 hectares of the planted stands in Talokola nursery were selected. A total of 24 trees were randomly selected and increment core were prepared. Calculation of diameter increment was done using meyer,s method. Relationship between incremental quantitative variables was revealed. The results showed that mean annual increment of diameter and stand product of the maple tree in considerable stand was 8.36 mm and 145.4 silve.h-1 respectively.
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