000 00316 a2200133 4500
080 _a631.8(063)
_bI 61 F
245 1 _aFertilization of protected crops
_bProceedings
260 _aSwitzerland
_bI.P.I.
_c1968
650 _aFertilizer
650 _aFertilization
100 _a
_d
300 _a390 p.
901 _a121609
999 _c82303
_d82303