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Intercepted radiation and yield of lentils (Lens culinaris) in Canterbury, New Zealand

Published online by Cambridge University Press:  27 March 2009

B. A. McKenzie  and
G. D. Hill
B. A. McKenzie
Affiliation:
Department of Plant Science, Lincoln University, Canterbury, New Zealand
G. D. Hill
Affiliation:
Department of Plant Science, Lincoln University, Canterbury, New Zealand
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Summary

Lentils were grown in 1984/85, 1985/86 and 1988/89 in Canterbury, New Zealand. Results showed that lentil canopies were capable of intercepting a maximum of 95% of incident solar radiation at a leaf area index of 7. Autumn sowings attained canopy closure, but late spring sowings did not. At the highest population density used (500 plants/m2), only 65% of incident solar radiation was intercepted by a late spring-sown crop. In all three growing seasons there was a highly significant positive relationship between cumulative absorbed radiation and dry matter (DM) production. Over all seasons, 1·6 g DM/m2 was produced per MJ of absorbed photosynthetically active radiation (PAR). The final utilization coefficient (u) was not affected by sowing date but in a late-sown, diseased crop, u was 38% less than in a disease free crop. In 1984/85, dryland crops had a utilization coefficient of 1·39 while irrigated crops had a u of 1·54. Growth efficiency of lentils was low, at 2·5%.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 117 , Issue 3 , December 1991 , pp. 339 - 346
Copyright
Copyright © Cambridge University Press 1991

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