00325nam a2200121Ia 450000500170000000800410001702000140005805000160007210000130008824500540010126000290015565000190018420251229192456.0251229s9999    xx            000 0 und d  a044441617  aSB 185 .P47  aPeter, J 0aYield formation in the main field crops cJ Peter  aOxford b Elsevierc1988  a1. Field Crops