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SEEDLING CHARACTERISTICS AND THE EARLY GROWTH OF TRANSPLANTED RICE UNDER DIFFERENT WATER REGIMES

Published online by Cambridge University Press:  01 July 2008

ABHA MISHRA  and
V. M. SALOKHE
ABHA MISHRA
Affiliation:
Agricultural Systems and Engineering, School of Environment, Resources and Development, Asian Institute of Technology, P. O. Box 4, Klong Luang, Pathumthani 12120, Thailand
V. M. SALOKHE*
Affiliation:
Agricultural Systems and Engineering, School of Environment, Resources and Development, Asian Institute of Technology, P. O. Box 4, Klong Luang, Pathumthani 12120, Thailand
*
†Corresponding author. salokhe@ait.ac.th
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Summary

A series of experiments was conducted on rice seedlings in a nursery seedbed and after transplanting in order to understand root and shoot characteristics, and their contribution to the production of tillers and dry matter. At the nursery stage, the seedlings' were studied at varying densities (high and low) and fertilizer treatments (with and without nitrogen) at 12 and 24 days after sowing (DAS) in wet or dry seedbeds. After transplanting, the effects of seedling age at the time of transplanting (12 and 30 days), method of raising seedlings (dry or wet seedbed) and water regimes (flooded or non-flooded) were studied. The overall aim was to understand the benefits, if any, of this system of rice intensification (SRI) management practices over conventional methods. The study revealed that in a nursery at 12 DAS, rice seedlings raised in a dry seedbed, irrespective of seeding density and fertilizer application, showed accelerated growth with better shoot and root characteristics in terms of greater leaf number, plant height, lateral root formation and elongation, and dry mass compared to seedlings grown in a wet seedbed. At 24 DAS, a significant interaction between seeding density and fertilizer application was found for dry-seedbed plants compared to those grown in a wet seedbed. Poor shoot and root growth was seen in older seedlings grown without fertilizer. Seedling age was found to be the most important factor affecting both shoot characteristics after transplanting (number of tillers, plant height, dry matter production) and root characteristics (root length density, root weight density). Younger seedlings performed better than older seedlings transplanted into either flooded or non-flooded soils with greater uptake of nitrogen and manganese than older seedlings. These results indicate that many of the constraints previously associated with non-flooded rice cultivation may be alleviated by transplanting younger seedlings that have been raised by SRI methods.

Type
Research Article
Information
Experimental Agriculture , Volume 44 , Issue 3 , July 2008 , pp. 365 - 383
Copyright
Copyright © Cambridge University Press 2008

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