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SHORT- TO MID-TERM IMPACT OF CONSERVATION AGRICULTURE ON YIELD VARIABILITY OF UPLAND RICE: EVIDENCE FROM FARMER’S FIELDS IN MADAGASCAR

Published online by Cambridge University Press:  20 June 2014

GUILLAUME BRUELLE ,
KRISHNA NAUDIN ,
ERIC SCOPEL ,
RAPHAËL DOMAS ,
LILIA RABEHARISOA  and
PABLO TITTONELL
GUILLAUME BRUELLE*
Affiliation:
CIRAD, UPR 115 AIDA, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Avenue Agropolis, 34398 Montpellier, Cedex 5, France
KRISHNA NAUDIN
Affiliation:
CIRAD, UPR 115 AIDA, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Avenue Agropolis, 34398 Montpellier, Cedex 5, France
ERIC SCOPEL
Affiliation:
CIRAD, UPR 115 AIDA, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Avenue Agropolis, 34398 Montpellier, Cedex 5, France
RAPHAËL DOMAS
Affiliation:
BRL, Lot II A 128 SGA Nanisana Iadiambola, 101 Antananarivo, Madagascar
LILIA RABEHARISOA
Affiliation:
Laboratoire des Radio-Isotopes, Route d’Andraisoro, BP 3383, 101 Antananarivo, Madagascar
PABLO TITTONELL
Affiliation:
CIRAD, UPR 115 AIDA, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Avenue Agropolis, 34398 Montpellier, Cedex 5, France Farming Systems Ecology, Wageningen University, P.O. Box 563, 6700AN Wageningen, The Netherlands
*
‡Corresponding author. Email: guillaume.bruelle@cirad.fr; Contact address: TA B-102/02, Avenue Agropolis, 34398 Montpellier, Cedex 5, France.
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Summary

Family farming in the tropics suffers from low crop productivity mainly due to a combination of poor soil fertility, low investment capacity, and a variable climate. The Lake Alaotra region of Madagascar is no exception and rainfed production is particularly hard hit. To evaluate the agronomic benefits of conservation agriculture (CA) in a region of erratic rainfall, we analysed four years of yield, management and climatic data from 3803 upland rice fields cultivated by farmers and monitored by researchers. Fields located on rainfed lowlands and hillsides were cultivated with sole rice using conventional tillage (Cv) or rice sown with no-tillage on dead organic mulch and rotated with other cereal/legume combinations (CA) from 2006 to 2011. A first global comparison across seasons, locations and years of adoption showed significantly higher average yields under CA, with no change in variance (on lowland: 2.6 ± 0.9 t ha–1 Cv, 2.8 ± 0.9 t ha–1 CA; on hillside: 2.1 ± 0.8 t ha–1 Cv, 2.4 ± 0.8 t ha–1 CA). Grouping fields according to the number of years under CA (first to fourth) revealed that CA gradually increased average yields and reduced the coefficient of variation in the short and mid-term (on lowland: +0.2 t ha–1 and –6% coefficient of variation; on hillside: +0.7 t ha–1 and –13% coefficient of variation, over four to six years of successive CA cropping). The average yield increase under CA was not associated with an increase in mineral fertiliser use, as farmers used the same amounts of fertilisers (or none) under Cv and CA. The comparison Cv versus CA also highlighted a major benefit of CA regarding climate: it widened the window of possible sowing dates. A classification and regression tree analysis of the entire dataset revealed that rice yield was more affected by agro-environmental factors than management factors (fertilisation, Cv or CA), and extreme climate variability such as the severe drought of 2007–2008 could not be offset by CA. The hypothesis of yield penalties during the first years of implementation of CA cannot be verified with the evidence presented in this study.

Type
Research Article
Information
Experimental Agriculture , Volume 51 , Issue 1 , January 2015 , pp. 66 - 84
Copyright
Copyright © Cambridge University Press 2014 

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