000 00305nam a2200121Ia 4500
008 140113s9999 xx 000 0 und d
082 _a631(02) N2.47
100 _a"Sparks, D.L."
245 _aAdvances in agronomy -vol.47
260 _a1992
_b Academic Press
_cCalifornia
300 _a412
942 _cBK
999 _c61155
_d61155