Segundo o Eurodicautom

Outras referências:

... EL - Greek: ×þìá åðéöáíåßáò. EN - English: Topsoil. ES - Spanish: Tierra vegetal. ...
PT - Portuguese: Terra vegetal. SV - Swedish: Matjord.
www.aaahaa.nl/kenniscentre2/ CPVlangu.php?in_CPVcode=14212410-7

O "topsoil" é a camada mais do solo, onde se concentram valores mais altos de matéria orgânica, fauna do solo e nutrientes.
www.geologiaambientalufc.hpg.ig.com.br/pag31.html

A habitual falta de "terra vegetal" implica um encarecimento importante dos custos de reabilitação.
Usual lack of topsoil implies important increases in the cost of rehabilitation.
www.scap.pt/scap_revista_artigos.asp?id_artigo=1970

... a terra vegetal deve ser decapada em toda a extensão da terraplenagem entre os pés de talude e colocada em depósito separado (the topsoil should be removed over the width of the earthworks between the slope stakes and stockpiled in separate heaps).
www.websters-dictionary-online.net/he/heaps.html

Topsoil is the uppermost layer of soil, usually the top six to eight inches. It has the highest concentration of organic matter and microorganisms, and is where most of the Earth's biological soil activity occurs. Plants generally concentrate their roots in, and obtain most of their nutrients from this layer. Topsoil can be measured as the depth from the surface to the first densely packed soil layer known as hardpan.
A major environmental concern known as topsoil erosion, occurs when the topsoil layer is blown or washed away. Without topsoil, little plant life is possible.
A variety of soil mixtures are sold commercially as topsoil, usually for use in improving gardens and lawns.
www.reference.com/browse/wiki/Topsoil