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ROLE OF INDIGO IN IMPROVING THE PRODUCTIVITY OF RAINFED LOWLAND RICE-BASED CROPPING SYSTEMS

Published online by Cambridge University Press:  01 April 1999

E. O. AGUSTIN ,
C. I. ORTAL ,
S. R. PASCUA JR ,
P. C. STA. CRUZ ,
A. T. PADRE ,
W. B. VENTURA ,
S. R. OBIEN  and
J. K. LADHA
E. O. AGUSTIN
Affiliation:
Mariano Marcos State University, Batac, Ilocos Norte, Philippines
C. I. ORTAL
Affiliation:
Mariano Marcos State University, Batac, Ilocos Norte, Philippines
S. R. PASCUA JR
Affiliation:
Mariano Marcos State University, Batac, Ilocos Norte, Philippines
P. C. STA. CRUZ
Affiliation:
Philippine Rice Research Institute, Muñoz, 3119 Nueva Ecija, Philippines
A. T. PADRE
Affiliation:
International Rice Research Institute, PO Box 933, 1099 Manila, Philippines
W. B. VENTURA
Affiliation:
International Rice Research Institute, PO Box 933, 1099 Manila, Philippines
S. R. OBIEN
Affiliation:
Philippine Rice Research Institute, Muñoz, 3119 Nueva Ecija, Philippines
J. K. LADHA
Affiliation:
Philippine Rice Research Institute, Muñoz, 3119 Nueva Ecija, Philippines
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Abstract

A long-term field experiment was conducted to determine the effects of indigo (Indigofera tinctoria) on the productivity of rainfed lowland rice-based cropping systems: rice–tomato, rice–tobacco or soyabean, rice–maize, and rice–garlic. Indigo was grown as an intercrop during the dry season and incorporated as green manure for wet season rice. Dry season crop yields were generally not affected by the indigo intercrop but indigo green manure had a positive effect on rice yields. At the same level of nitrogen (N) inputs, indigo-N produced higher yields than urea-N which may be due to high inorganic N losses.

Type
Research Article
Information
Experimental Agriculture , Volume 35 , Issue 2 , April 1999 , pp. 201 - 210
Copyright
© 1999 Cambridge University Press

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