s:456:"%T Improved methods for the extraction of soil samples for root research 
%A Van, Noordwijk.M. 
%A Floris, J. 
%X A monolith sampler is described which makes it possible to obtain pinboard samples  from the field without digging a trench. Also for container experiments a method is presented  by which the complete soil column can be pushed out of plastic tubes (containers) to permit  examination of the intact root system without cutting the tubes. 
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