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Fig. 5. Total plant dry weight and N content for green manure crops as functions of time (A and B, respectively) and as functions of cumulative intercepted photosynthetically active radiation (PAR; C and D, respectively). Green manure crops shown are: sunn hemp during 2001 ( ${square}$ ) and 2002 ( ${circ}$ ), lupin during 2001–2002 ( ${triangleup}$ ), and vetch ( ${diamond}$ ) during 2002–2003. Error bars reflect standard error values.