An evaluation of some laboratory methods of assessing the availablity of nitrogen in agricultural soils

Abstract

Soil samples were obtained from various cereal growing sites in Canterbury via the Ravensdown Fertiliser Co-operative and from MAF nitrogen fertiliser field trials in the South and North Islands. These samples were used to compare the current Ravensdown Fertiliser Co-operative soil test(s) and some selected laboratory methods .of assessing soil nitrogen (N) availability.