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Wien, Univ. für Bodenkultur (2011)

The challenges of conservation agriculture to increase maize yield in vulnerable production systems in Central Mozambique

Famba, Sebastião Inácio

Titre : The challenges of conservation agriculture to increase maize yield in vulnerable production systems in Central Mozambique

Auteur : Famba, Sebastião Inácio

Université de soutenance : Wien, Univ. für Bodenkultur

Grade : Dr. nat. techn. 2011

Résumé
Smallholder farming under rainfed low input crop production in central Mozambique is characterized by considerable risk of crop failure, low yields and substantial decline in soil fertility ; therefore, many rural households face food insecurity. In the perspective to revert this situation, conservation agriculture (CA) has been promoted. This study presents the results of CA on-station long term trial (LTT) in Sussundenga (central Mozambique), on maize yield and soil water balance. Local climate is wet semi-arid, soil type is Lixisol and texture is sandy loam. The APSIM model was satisfactorily calibrated using additional high fertilized trial in the site and used to simulate crop yield and water balance for the LTT ; root mean standard error (RMSE) was 2-4% volume on soil water and 6% on grain yield. High termites’ activity in the area prevented the accumulation of crop residues in CA ; therefore, field results did not show significant differences in maize yield. The water balance study showed that 47-52% of rain was lost as runoff, and deep drainage was 0-7% on maize cropping under traditional tillage. Simulating crop residues, the resulted runoff abstraction favoured drainage ; maize residues resulted in nitrogen immobilization ; and yield reduction in the wetter season 2008-09 ; therefore, yield doubled for the drier season 2009-10. Nevertheless, experimental results are needed to investigate the extent of nitrogen immobilization. This study did not show immediate benefits of CA for quick adoption by smallholder farmers, therefore, field observation suggest that the direct seeding would be very useful as a low energy optio

Mots clés : Direktsaat / Bodenwasserbilanz / APSIM Model / Mais / Mosambik — Conservation agriculture / soil water balance / APSIM model / maize / Mozambique

Présentation (österreichischen Bibliothekenverbundes)

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Page publiée le 25 décembre 2015, mise à jour le 13 mars 2019