Radiation interception of oat/vetch intercrop [Tuscany]
1997
Ercoli, L. (Scuola Superiore di Studi Universitari e di Perfezionamento S. Anna, Pisa (Italy)) | Mariotti, M. | Masoni, A. (Pisa Univ. (Italy). Dipartimento di Agronomia e Gestione dell'Agroecosistema)
The research was carried out aiming at analyzing the radiation balance within the canopy of sole and intercropped oats (Avena sativa L.) and common vetch (Vicia sativa L.). The intercrop had an additive design and a 1:1 component ratio. At oats phenological stages of second note detectable, heading and milk ripening, radiation incoming (I), reflected (R) and transmitted (T) by the canopy, utilizing line quantum sensors, were measured. Absorbed radiation was estimated with the relation: A = I + Rt1 - T - R. At all harvests dry weight, photosynthetic area and chlorophyll content of aerial part and its components were determined. Oat/vetch intercrop produced higher biomass, photosynthetic area and chlorophyll content per unit soil area than oats and vetch sole crops. The intercrop absorbed 20% higher radiation than the average of sole crops, due essentially to a lower amount of radiation transmitted by the canopy. The amounts of radiation absorbed by the canopies, expressed as percentage of incoming radiation, were correlated more with chlorophyll content than with leaf area index and total area index, following an asysmptotic model as: y = a * (1 +- b * e** (-k*x)). The intercrop, respect to sole crops, had also an higher radiation use efficiency (RUE) value
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