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Seed yield in caraway (Carum carvi). 1. Role of pollination

Published online by Cambridge University Press:  27 March 2009

H. J. Bouwmeester
Affiliation:
Research Institute for Agrobiology and Soil Fertility, Postbox 14, 6700 AA Wageningen, The Netherlands
H. G. Smid
Affiliation:
Research Institute for Agrobiology and Soil Fertility, Postbox 14, 6700 AA Wageningen, The Netherlands

Summary

Seed yields of caraway vary considerably between years, indicating that weather affects the yield-determining processes. Pollination could be one of these processes, because pollinator activity and efficiency are negatively affected by cold or wet weather. From 1990 to 1992 at the Research Institute for Agrobiology and Soil Fertility in Wageningen, The Netherlands, field and glasshouse experiments were performed to study the importance of pollination for caraway seed yields and the effects of some environmental factors. Preventing insect pollination by placing gauze cages in field plots reduced the yield of caraway by c. 15–20%, but under normal field conditions > 90% of hermaphrodite flowers were fertilized and additional hand-pollination did not improve yield. Removal of competing umbels enhanced the low seed set percentages in higher-order umbels, indicating that pollination did not limit seed yield in these umbels. Assays suggested that wind transfer, in addition to insects, plays a role in the pollination of caraway. It was concluded that assimilate availability and not pollination limits caraway seed yield.

Type
Crops and Soils
Copyright
Copyright © Cambridge University Press 1995

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