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Titolo:
Light absorption and water loss in overwintered and spring-sown evening primrose (Oenothera spp.) crops
Autore:
Fieldsend, A; Morison, JIL;
Indirizzi:
Scotia Pharmaceut Ltd, Plant Technol Ctr, Writtle Coll, Chelmsford CM1 3RR, Essex, England Scotia Pharmaceut Ltd Chelmsford Essex England CM1 3RR RR, Essex, England Univ Essex, Dept Biol Sci, Colchester CO4 3SQ, Essex, England Univ Essex Colchester Essex England CO4 3SQ ester CO4 3SQ, Essex, England
Titolo Testata:
EUROPEAN JOURNAL OF AGRONOMY
fascicolo: 4, volume: 14, anno: 2001,
pagine: 275 - 291
SICI:
1161-0301(200107)14:4<275:LAAWLI>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
CLIMATE; WINTER; EFFICIENCY; GROWTH; YIELD;
Keywords:
evening primrose; Oenothera spp; light interception; light conversion efficiency; water loss; biomass water ratio; water use efficiency; soil water deficit;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Fieldsend, A 70 Pickwick Ave, Chelmsford CM1 4UR, Essex, England 70 Pickwick Ave Chelmsford Essex England CM1 4UR ex, England
Citazione:
A. Fieldsend e J.I.L. Morison, "Light absorption and water loss in overwintered and spring-sown evening primrose (Oenothera spp.) crops", EUR J AGRON, 14(4), 2001, pp. 275-291

Abstract

Evening primrose (Oenothera spp.) is a high-value oilseed crop for temperate areas which may be either overwintered or spring-sown. Light absorption,light use efficiency, water loss and biomass water ratio were compared between overwintered and spring-sown crops of cv. Merlin in two years of held trials. An overwintered crop of cv. Peter was also studied in year two. Theenergy content of evening primrose plant material was shown to be similar to other crops. Both overwintered and spring-sown crops can achieve full canopy closure and maintain high fractional photosynthetically active radiation (PAR) interception for long periods but canopy closure occurred much later than in other temperate seed crops. In spring-sown evening primrose, maximum PAR interception did not occur until August, by which time incident light levels were declining and consequently the proportion of incident lightenergy captured during the main growing season was low. Most light was intercepted by green leaves and very little shading by senescent tissue and flowers occurred. Light conversion efficiencies for the main growing period were comparable with other temperate C, crops, but in year two a steep decline in light conversion efficiency was observed as the crops matured and thesoil water deficit exceeded 60 mm. In year one, water loss from both the overwintered and spring-sown crops were low and the soil water deficit increased relatively slowly. By contrast, in the year two crop water loss was high and the soil water deficit built up very rapidly between the end of Juneand crop maturity. No significant differences in biomass water ratio (water use efficiency) were recorded between overwintered and spring-sown crops but ratios were 50% higher in year one than in year two. Although no relationship was detected between biomass water ratio corrected for vapour pressure deficit ("normalised") and soil water deficit, after canopy closure normalised daily water loss declined with increasing soil water deficit. Earlier canopy closure, particularly in the spring crop, and the avoidance of soil water deficits through irrigation, would lead to substantial improvementsin the size and consistency of seed yields of evening primrose crops. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 09:14:55