Mathes, D.T.2014-06-032014-06-031981Ceylon Coconut Quarterly, 32(3-4):p.111-113https://dl-cri.nsf.gov.lk//handle/1/3424FertilizersFertilizer trialsSoil depthCalibrationStatistical analysisSignificance of using soil depth as a calibrating variate in afertilizer experiment on coconut yield