[lemma=public | □] □
[lemma=public | □=□] □
[lemma=public | !□] □
One method of control is to hang a very strongly scented bar of soap in each tree in summer . If the risk seems large , or is out of control and is likely to cause a major event phone the emergency number ( Extension 4444 ) and inform Central Services of the nature of the event so that the Emergency Services can be called and appropriate precautions can be taken . Areas which had high soil moistures also had significantly higher rates ( by over an order of magnitude ) of CH4 and CO2 fluxes than areas of low soil moisture . ) have shown this to be true in fire-disturbed black spruce forests in Alaska , where fluxes of CH4 and CO2 were greater within the burned sites than unburned sites . These latter features are of great significance in the determination of authenticity of a document . Lower amounts of humus and plant root structure in areas of sparse vegetation make these soils especially vulnerable to wind erosion during periods of lower soil moisture . Water limitation , for example , is an obvious problem in the world 's arid environments and associated irrigation leads to a build-up of salt levels in soil .