000			00453 a2200157 4500
082			_a631.558 _bPHY
090			_c22015 _d34556
245			_aPhysiological aspects of crop productivity
260			_aSwitzerland _bInternational Potash Institute _c1980 _g1980
300			_a274p. _c23cm
650			_aYields
650			_aSpecific techniques:apparatus, equipment, materials
650			_aCultivation and harvesting
650			_aHarvesting
942			_cL
999			_c49430 _d49430