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	Fluorescenza della Clorofilla	Equazione di Penman-Monteith
Campo	Agronomia	Agronomia
Famiglia	Process / pipeline	Process / pipeline
Anno di origine	1931-2004	1948-1965
Ideatore	Hans Kautsky, Ulrich Schreiber, Reto J. Strasser	Howard Latimer Penman, John Monteith
Tipo	Non-invasive photosynthetic measurement	Mechanistic evapotranspiration model
Fonte seminale	Kautsky, H., & Hirsch, A. (1931). Neue Versuche zur Klärung der Assimilationstätigkeit. Naturwissenschaften, 19(48), 964-964.	Penman, H. L. (1948). Natural evaporation from open water, bare soil and grass. Proceedings of the Royal Society A, 193(1032), 120-145.
Alias	Fluorescence, Fv/Fm, OJIP curve, PAM fluorometry	PM Equation, FAO-56 PM, Evapotranspiration Model
Correlati	3	3
Sintesi	Chlorophyll fluorescence is a non-invasive optical measurement of how efficiently the photosynthetic machinery converts absorbed light into chemical energy (photosynthesis) or heat and light (fluorescence). When photosynthesis is inhibited by stress (drought, cold, salt, pests), chlorophyll fluorescence increases because excitation energy cannot be used for photosynthesis and must be released as light or heat. Fluorescence parameters (Fv/Fm, OJIP curves) act as sensitive, rapid indicators of photosynthetic stress, enabling early detection of plant dysfunction before visible symptoms appear.	The Penman-Monteith equation is a mechanistic model for estimating evapotranspiration (ET), the combined loss of water from soil and plant canopies to the atmosphere. First proposed by Penman (1948) for bare soil and water surfaces, then extended by Monteith (1965) to incorporate plant resistance to water vapor diffusion, it has become the international standard for water balance studies, crop water requirement calculation, and hydrological modeling.