3 1914 



Divisiou of Forestry 

 University of California 



YIELD fROM EUCALYPTUS PLANTATIONS IN CALIFORNIA. 



INTRODUCTION. 



The study of yield from eucalyptus plantations in California was 

 made in cooperation between the California State Board of Forestry 

 and the Forest Service of the United States Department of Agriculture. 

 The field work extended over a period of two months (June 24 to 

 August 30, 1910), during which time practically all the important 

 eucalyptus groves of any extent within the State were visited and ex- 

 amined. Sample plots, usually a quarter of an acre in extent, were 

 measured off within the groves showing the best growth. The diameter 

 of every tree within the sample plot was carefully measured with a 

 diameter tape, and the average height of the trees of the different diam- 

 eter classes was obtained with the Forest Service hypsometer-grade- 

 meter. Usually only one such sample plot, selected to show average 

 conditions, was measured in each grove, but in several instances, in the 

 larger groves, two sample plots were taken and the results averaged. 

 The sample plots were located in the interior of each grove, and excluded 

 the larger but shorter trees in the outside rows in order to obtain aver- 

 age conditions of yield in the interior of the plantations. With few 

 exceptions no measurements were taken in groves less than an acre in 

 extent or under three years of age. 



The object of this report is to give in tabular form the results of 

 measurements thus obtained. The figures given represent the actual 

 yield now on the ground in the best eucalyptus groves in California. 



FACTORS INFLUENCING GROWTH. 



Soil. While eucalyptus is greatly influenced by the quality of the soil, 

 and under similar temperature and moisture conditions will make the 

 best and most rapid growth on soil of good quality, care must be taken 

 not to overestimate the effect of the quality of the soil on its rate of 

 growth. One of the best groves in the State (the Linda Vista Grove 



