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Nitrogenase activity, nodulation and seed production in Vicia faba as affected by methabenzthiazuron

Published online by Cambridge University Press:  27 March 2009

J. Martínez ,
D. Vidal  and
E. Simón
J. Martínez
Affiliation:
Department of Plant Biology, Faculty of Biology, University of Barcelona, Barcelona, Spain
D. Vidal
Affiliation:
Department of Plant Biology, Faculty of Biology, University of Barcelona, Barcelona, Spain
E. Simón
Affiliation:
Department of Plant Biology, Faculty of Biology, University of Barcelona, Barcelona, Spain
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Summary

The effects of recommended application rates of the herbicide methabenzthiazuron (MBT) (2·5 and 4 kg ha-1) on vegetative growth, nodulation and N2 fixation in faba bean plants were studied in the field at Barcelona during 1990 and 1991. Nodulation, specific nitrogenase activity (SNA) of excised nodules, dry weight of plants and seed nitrogen content at harvest were compared in MBT-treated, hand-weeded (HW) and control plants. In 1990 the higher MBT application (4 kg ha-1) caused a decrease in nodulation and acetylene reduction activity (ARA) per plant during the mid-period of pod-fill, and also in vegetative growth, seed production and N content of seeds, whereas the lower rate (2·5 kg ha-1) did not have a significant effect on any of these factors. However, in 1991, growth and herbicide effects were different from those in the previous year. No inhibitory effect of MBT on nodulation, SNA or ARA per plant was observed and vegetative growth, seed production and N content of seeds were not significantly different from those of plants from HW plots. In 1991, both 4 kg ha-1 of MBT and the HW treatment caused a stimulatory effect on seed N recovery and yield compared to control plants. Rates of ARA per plant at late pod-fill were positively related to N recovery by seeds. These differences could have been due to the low rainfall in 1990, which may have permitted MBT to remain in the soil for a longer period and to inhibit N fixation and plant growth in the Vicia faba crop.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 127 , Issue 3 , November 1996 , pp. 319 - 324
Copyright
Copyright © Cambridge University Press 1996

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