000 00281nam a2200133Ia 4500
008 230108s9999 xx 000 0 und d
100 _aCSSA
245 0 _aCrop Science Vol.30 No.4-6
260 _bCSSA
260 _c1990
365 _b0.00
650 _aAgronomy
942 _cBK
999 _c249335
_d249335