Serrano, Joćo M Monitoring pasture variability: optical OptRx(®) crop sensor versus Grassmaster II capacitance probe. [electronic resource] - Environmental monitoring and assessment Feb 2016 - 117 p. digital Publication Type: Journal Article ISSN: 1573-2959 Standard No.: 10.1007/s10661-016-5126-5 doi Subjects--Topical Terms: Agriculture--methodsAnimalsCrops, AgriculturalEnvironmental Monitoring--instrumentationPlantsPoaceaeSeasonsSoil