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Solar radiation interception by leafless, semi‐leafless and leafed peas ( Pisum sativum ) under contrasting field conditions
Author(s) -
HEATH M. C.,
HEBBLETHWAITE P. D.
Publication year - 1985
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1985.tb01575.x
Subject(s) - interception , biology , sativum , pisum , photosynthetically active radiation , photosynthesis , dry matter , petiole (insect anatomy) , agronomy , tendril , leaf area index , botany , horticulture , ecology , hymenoptera
SUMMARY Foliage composition, photosynthetic area index (PAI) and radiation interception were measured for crop canopies of leafless (var. Filby), semi‐leafless (var. BS3) and leafed (var. Birte) peas ( Pisum sativum ). Tendrils and petioles contributed more than 60% of total leaf area for leafless peas but less than 30% for semileafless and leafed pea canopies. PAI was related to radiation interception by calculating attenuation coefficients which indicated that leafless peas intercepted more radiation per unit PAI than either semi‐leafless or leafed peas. Data interpretation, however, was complicated because of difficulties in estimating the tendril and petiole surface area contribution to PAI. Radiation interception was related to dry matter accumulation by calculating photosynthetic efficiencies. Leafless and semi‐leafless peas converted intercepted radiation into dry matter as efficiently as leafed peas. Under conditions of moisture stress, leafed and leafless peas both intercepted radiation more effectively but converted it into dry matter with reduced photosynthetic efficiency.