Rotation length

Thinning Growth rate and hence rotation length... 

Rotation length Affects mean age of wood and hence basic density... 

The viability of any intensive silvieultural programme is tied elosely to the rotation length and the premium to be paid for quality material, whether that be for... 

Traditional plantation culture in this country has approximated what occurs in nature. In this situation trees are planted at fairly wide spacing (6 feet or more) often with little or no site preparation. Occasionally, the trees are released from competing vegetation and the plantation may be thinned once or twice. The rotation length of these plantations may be 30 years or more, depending on the growth rate and end product desired. Coniferous trees, particularly the pines, have been planted far more often than hardwoods. 

The condition for the maximum twinniug suppression is fulfilled for example for the quartz bar of the orientation (XYa) 150° for the transversal piezoelectric effect. The mechanical load is applied in the direction of rotated length axis at this time. Electrodes cover the surfaces perpendicular to the xi -axis. Condition Eq. (7.8) cannot be fiilfilled for the quartz elements for the longitudinal piezoelectric effect at all. The longitudinal piezoelectric coefficient is equal to zero for such orientations. Practical apphcation must be designed in order to get the twiiming suppression as high as possible simultaneously with sufficient piezoelectric coefficient. 

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