000 00309nam a2200121Ia 4500
008 140113s9999 xx 000 0 und d
082 _a631(02) N3.49
100 _a"Sparks, D.L."
245 _aAdvances in Agronomy -vol. 49
260 _a1993
_bAcademic Press Inc.
_cCalifornia
300 _a323
942 _cBK
999 _c61171
_d61171