?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Simulating+trends+in+crop+yield+and+soil+carbon+in+a+long-term+experiment+%C3%A2%C2%80%C2%93+effects+of+rising+CO2%2C+N+deposition+and+improved+cultivation&rft.creator=Berntsen%2C+J.&rft.creator=Petersen%2C+B.M.&rft.subject=+Soil&rft.subject=+Soil+quality&rft.description=Measurements+of+crop+yield+and+soil+carbon+in+the+Bad+Lauchst%C3%83%C2%A4dt+long-term+fertilizer+experiment+were+analysed+with+the+FASSET+model.+The+model+satisfactorily+predicted+yield+and+soil+carbon+development+in+four+treatments+with+no+fertilizer%2C+mineral+fertilizer%2C+farm+yard+manure+and+farm+yard+manure+plus+mineral+fertilizer%2C+respectively.+%0D%0AAn+analysis+of+the+difference+between+observed+and+simulated+yield+showed+an+increasing+trend+with+years.+This+increase+could+be+attributed+to+an+increase+in+observed+yields+during+the+last+six+decades.+Scenario+analysis+showed+that+the+most+probable+explanation+for+this+yield+increase+was+new+crop+varieties+and%2For+use+of+pesticides%2C+while+the+increase+in+atmospheric+CO2+and+changes+in+local+N+deposition+were+of+lesser+importance.+The+rise+in+CO2+thus+only+explained+between+9-37%25+of+the+yield+increase.+%0D%0AThe+observed+and+simulated+development+in+soil+carbon+was+quite+different+in+the+four+treatments.+However%2C+the+changes+within+each+treatment+for+different+scenarios+were+much+smaller+than+the+substantial+difference+between+treatments.+Thus+it+was+concluded+that+the+fertilizer+type+was+more+important+than+the+analysed+anthropogenic+factors+for+the+development+in+soil+carbon.&rft.date=2005&rft.type=Journal+paper&rft.type=NonPeerReviewed&rft.format=source&rft.identifier=http%3A%2F%2Forgprints.org%2F4643%2F1%2F4643.doc&rft.identifier=Berntsen%2C+J.+and+Petersen%2C+B.M.+(2005)+Simulating+trends+in+crop+yield+and+soil+carbon+in+a+long-term+experiment+%C3%A2%C2%80%C2%93+effects+of+rising+CO2%2C+N+deposition+and+improved+cultivation.+[+Submitted+%2C+2005]+**&rft.relation=http%3A%2F%2Forgprints.org%2F4643%2F