00502nam a22001817a 4500003000400000020001800004082001600022100001500038245004100053260004700094300001200141546001200153650003700165650002400202650004000226650002300266650003100289OSt  a9780521295581  a633bEVA/CR  aEvans, L T  aCrop evolution, adaptation and yield  aNew YorkbCambridge university pressc1993  ax,500p.  aEnglish  acrop yield and world food supply  athe future of yield  aadaptation and the ecology of yield  aincreases in yield  aefficient use of resources