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THE INFLUENCE OF NITROGEN-FIXING TREES AND FERTILIZER NITROGEN LEVELS ON THE GROWTH, YIELD AND NITROGEN UPTAKE OF COWPEA ON A RAINFED ALFISOL

Published online by Cambridge University Press:  01 January 2000

G. SURESH  and
J. V. RAO
G. SURESH
Affiliation:
Central Research Institute for Dryland Agriculture, Santoshnagar, Hyderabad-500 059, India Current address: Indian Grassland and Fodder Research Institute (IGFRI), Jhansi (UP)-284 003, India. Email: [email protected]
J. V. RAO
Affiliation:
Central Research Institute for Dryland Agriculture, Santoshnagar, Hyderabad-500 059, India
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Abstract

A field experiment was conducted to study the influence of 8- to 9-year-old nitrogen-fixing tree species (Faidherbia albida, Acacia ferruginea, Albizia lebbeck) and fertilizer nitrogen levels on yield and nitrogen uptake of intercropped cowpea (Vigna unguiculata). Grain and dry fodder yields of cowpea were reduced by 9% to 27% and by 11% to 35% respectively compared with the sole crop. Application of fertilizer nitrogen produced significantly higher yields. Nitrogen uptakes by leaves, stems and grain of cowpea were significantly reduced under A. ferruginea and A. lebbeck, but cowpea as sole crop and under F. albida showed no differences. Nitrogen uptake in different plant parts increased with increase in fertilizer nitrogen level.

Type
Research Article
Information
Experimental Agriculture , Volume 36 , Issue 1 , January 2000 , pp. 41 - 50
Copyright
© 2000 Cambridge University Press

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