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The effect of plant population density on carbohydrate partitioning and nitrogen fixation of two bean (Phaseolus vulgaris L.) cultivars in two tropical locations

Published online by Cambridge University Press:  27 March 2009

L. Waters Jr ,
P. H. Graham ,
P. J. Breen ,
H. J. Mack  and
J. C. Rosas
L. Waters Jr
Affiliation:
Department of Horticulture, Oregon State University, Corvallis, Oregon 97331, U.S.A.
P. H. Graham
Affiliation:
Centra Internacional de Agricultura Tropical, Apartado Aereo 67–13 Cali, Colombia
P. J. Breen
Affiliation:
Department of Horticulture, Oregon State University, Corvallis, Oregon 97331, U.S.A.
H. J. Mack
Affiliation:
Department of Horticulture, Oregon State University, Corvallis, Oregon 97331, U.S.A.
J. C. Rosas
Affiliation:
Centra Internacional de Agricultura Tropical, Apartado Aereo 67–13 Cali, Colombia
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Summary

Bean cultivars Cargamanto (CIAT P590, indeterminate climbing, Type IV) and Puebla 152 (CIAT P498, indeterminate large vine, Type III) were grown at 20 and 60plants/m2 at two locations in Colombia; a cool, high rainfall, mountainous area (Popayan) and a hot, medium rainfall, valley (Palmira). The crop growth period was compressed and P590 failed to flower at Palmira.where plant shoot weights tended to be higher and root weights lower than at Popayan.

Midday soil temperatures at 10 cm averaged 7·8 °C lower and N2(C2H2) fixation rate and nodule fresh weight over ten-fold higher at Popayan than at Palmira. Increasing the plant population density increased yield but reduced seed weight per plant and the fresh weight of all other plant parts, with shoots more severely affected than roots. Density had little effect on carbohydrate concentration or N2(C2H2) fixation per plant. The cultivars accumulated carbohydrates in different amounts but had similar rates of N2(C2H2) fixation. Concentrations of ethanol insoluble carbohydrates were several times higher in all plant parts at Popayan. Soluble carbohydrates showed similar, but smaller, differences.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 100 , Issue 1 , February 1983 , pp. 153 - 158
Copyright
Copyright © Cambridge University Press 1983

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