00444nam a22001217a 4500082002000000245013100020260006000151300003200211650002900243700002000272700001400292700001600306  a631.422  RAJ/SO  aSoil fertility assessment and information management for enchancing crop productivity in Kerala /cKerala State Planning Board  aThiruvanathapuram :bKerala State Planning Boardc2013.  axiii, 522 p. :bill. ; map.  aSoil fertility -- Kerala  aRajasekharan, P  aNair, K.M  aRajasree, G