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YIELD TRENDS AND APPARENT NUTRIENT BALANCES IN INTENSIFIED AND DIVERSIFIED RICE-BASED CROPPING SYSTEMS

Published online by Cambridge University Press:  01 April 1999

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

A long-term field trial was conducted to determine yield trends in relation to nutrient uptake and efficiency in different rice-based cropping systems. The cropping systems had a significant effect on wet season rice yield when residues were not recycled but had no effect otherwise. Rice yield decreased after the first year of crop residue incorporation but increased every year thereafter. Rice yield was significantly affected by residual nutrients applied to dry season crops. The highest residual effect was observed in tomato and sweet pepper to which the highest nitrogen (N), phosphorus (P) and potassium (K) rates were applied. Maize, sweet pepper, and tomato responded well to NPK application, garlic had a low response and mungbean had no response. A relay crop served as a catch crop for excess nutrients and as shade to minimize sunscald effects for tomato and sweet pepper fruits.

Type
Research Article
Information
Experimental Agriculture , Volume 35 , Issue 2 , April 1999 , pp. 181 - 199
Copyright
© 1999 Cambridge University Press

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