000 00316nam a2200121Ia 4500
008 220204s9999 xx 000 0 und d
082 _a631.8
_bNEL
245 0 _aChanging patterns in fertilizer use
260 _aUSA
_bSoil Sc Soc of Agronomy
_c1968
650 _aFertilizer use
700 _aNELSON, L B
942 _cBK
999 _c22507
_d22507