... VNUJournal of Science,EarthSciences23(2007)231‐234231 Preliminarystudy of weatheringcrust for changingplantationDauHien,VuVanHa,MaiThanhTan*Institute of GeologicalSciences,VietnameseAcademy of ScienceandTechnologyReceived23March2007;receivedinrevisedform28September2007Abstract. ... issuitable for tea,coffee,sugar‐cane,etc.;thesaproliteweatheringcrustissuitable for bamboogroup;The ferosialite weathering crust, depending on the bedrock, is suitable for many ... Thesestudyresultsmaybesupplementedtoachieveasoundorientationinchangingplantation.Keywords:Weatheringcrust;Plantationchange;HoaBinhProvince.1.Introduction1Vietnamisahumidtropicalcountrywherethe weathering process is strongly developed,leading to rapid and extensive formation of weatheringcrust.After the work of Fritland [1], weatheringstudiesinVietnamwereintensivelycarriedoutand...