000			00340nam a2200121Ia 4500
008			140208s9999 xx 000 0 und d
020			_a00021962
044			_aU.S.A.
245			_aAgronomy Journal. v.85(n1-3), Jan-July, 1993 _c
260			_bAmerican Society of Agronomy _aWisconsin _c1993
300			_av.85, 778 p.; 28cm.
942			_2udc _cP
999			_c24696 _d24696