Precision Agriculture · 1999 · 162 citations · 9 references
AgricultureEarth SciencesSoil SciencesSoil ChemistrySoil Organic MatterSoil ScienceNitrogen CycleSoil Fertility EvaluationSoil Nitrogen ChemistrySoil Nitrogen SensingSoil Nutrient AvailabilityNitrogen Status DiagnosticsOptical Soil Nitrogen SensorsReal-time Soil Nitrogen MonitoringSoil Nitrogen AssessmentSoil Nitrogen Concentration EstimationSoil Nitrogen Sensing AccuracySoil Nitrogen Status Diagnosis
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Nitrates, nitrites and gastric cancer in Great Britain
David Forman, Samim A. Al-Dabbagh, Richard Doll · Nature · 1985 · 309 citations
Reflectance Technique for Predicting Soil Organic Matter
P. Krishnan, John D. Alexander, B. J. Butler et al. · Soil Science Society of America Journal · 1980 · 253 citations