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Environmental and Agronomic Effects on the Growth of Four Peanut Cultivars in a Sub-tropical Environment. II. Dry Matter Partitioning

Published online by Cambridge University Press:  03 October 2008

M. J. Bell ,
G. C. Wright  and
G. Harch
M. J. Bell
Affiliation:
Queensland Department of Primary Industries, PO Box 23, Kingaroy, 4610 Queensland, Australia
G. C. Wright
Affiliation:
Queensland Department of Primary Industries, PO Box 23, Kingaroy, 4610 Queensland, Australia
G. Harch
Affiliation:
Queensland Department of Primary Industries, PO Box 23, Kingaroy, 4610 Queensland, Australia
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Summary

The partitioning of dry matter between vegetative and reproductive yield components was analysed for four diverse peanut cultivars at a range of sowing dates and plant populations in sub-tropical Queensland, Australia. Rates of accumulation of pods (pod addition) varied significantly with both cultivar and sowing date. Within cultivars, much of this variation could be attributed to variation in crop growth rate during the critical pod addition period. The proportion of current assimilate distributed to pods depended on inherent cultivar characteristics and also correlated well with the current crop growth rate relative to the crop growth rate during pod addition (that is, with relative source activity). Neither plant density nor spatial arrangement had any significant effects on patterns of assimilate distribution. All cultivars appeared capable of remobilizing stored assimilate to maintain constant rates of pod yield increase despite fluctuations in crop growth rate which might be expected to produce short term source limitations to pod yield accumulation. The harvest index (HI) increased linearly during the entire pod fill period in all cultivars except the very early maturing Spanish cultivar Chico. Neither density nor spatial arrangement affected rate of increase in HI except in Chico, where increased density produced increased rates of increase in HI. Variation in the rate of HI increase among sowing dates was small.

Distributión de la materia seca en el maní

Type
Research Article
Information
Experimental Agriculture , Volume 29 , Issue 4 , October 1993 , pp. 491 - 501
Copyright
Copyright © Cambridge University Press 1993

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