Canopy Duration and Structure of Pigeonpea Intercropped with Upland Rice

Ramakrishna, A and Ong, C K and Reddy, S L N (1992) Canopy Duration and Structure of Pigeonpea Intercropped with Upland Rice. Experimental Agriculture, 28. pp. 295-307. ISSN 0014-4797

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Interactions between upland rice and three phenologically distinct pigeonpea cultivars were examined on a medium deep Vertisol. The productivity of each intercrop component and its respective sole crop was determined in terms of a crop performance ratio (CPR). The extra-early pigeonpea cultivar recorded the largest partial CPR of grain followed by early and medium genotypes. Spreading genotypes had a larger partial CPR than semi-compact genotypes. However, the CPR of intercropped rice was less (0.65–0.69) with spreading pigeonpeas but exceeded unity with compact types. The canopy structure of pigeonpea appeared to be more important than differences in phenology. A large range of light transmission coefficients (K) existed in pigeonpea (from 0.45 to 0.78) but it is argued that a further reduction in K may not be necessary since intercropped rice yield was unaffected even with a K of 0.64. The relative height of intercropped pigeonpea and upland rice may also determine competitive ability since rice is very sensitive to low light and shading, particularly during the reproductive phase.

Item Type: Article
Subjects: Mandate crops > Pigeonpea
Depositing User: Mr Charan Sai Ch
Date Deposited: 21 Oct 2011 13:33
Last Modified: 21 Oct 2011 13:33
Official URL:
Acknowledgement: We wish to thank Mr A. A. H. Khan for assistance in measuring light interception and Mr K. V. Ravindra for computer services. In the course of study a number of technicians-Mr P. Keshava Reddy, Mr K. Ashok Reddy, Mr B. S. R. Murthy, Mr K. Muir, Mr Bikshapathi and Mr A. V. Rao-assisted us in the field work. Thanks are also due to Mr K. N. V. Satyanarayana, Mr K. P. Ch. Raju and Mr V. Mohan Reddy for secretarial assistance.
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