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Combined effects of cover crops, mulch, zero-tillage and resistant varieties on Striga asiatica (L.) Kuntze in rice-maize rotation systems

Randrianjafizanaka Meva Tahiry, Autfray Patrice, Andrianaivo Alain-Paul, Ratsimiala Ramonta Isabelle, Rodenburg Jonne. 2018. Combined effects of cover crops, mulch, zero-tillage and resistant varieties on Striga asiatica (L.) Kuntze in rice-maize rotation systems. Agriculture, Ecosystems and Environment, 256 : pp. 23-33.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Quartile : Outlier, Sujet : AGRICULTURE, MULTIDISCIPLINARY / Quartile : Q1, Sujet : ECOLOGY / Quartile : Q2, Sujet : ENVIRONMENTAL SCIENCES

Abstract : In low-input rice-maize rotation systems in the hills of central Madagascar, farmers deal with erratic rainfall, poor soils, high soil erosion risks and infestation by the parasitic weed Striga asiatica (L.) Kuntze. Practices combining zero-tillage with permanent soil cover by intercropped legumes and crop residue mulches — known as Conservation Agriculture (CA)— are proposed as remedy against soil and climatic constraints. Implications of these practices for S. asiatica are unknown. A 4-season factorial experiment compared the current farmer practice of rice − maize rotation, involving seasonal tillage and crop residue removal (CONV), with three rice − maize rotation systems following CA with different cover crops, i.e. Vigna unguiculata (cowpea) and Mucuna pruriens (CACM), Vigna umbellata (ricebean) (CARB), and Stylosanthes guianensis (CAST). Performance of two rice varieties, NERICA-4 and −9, with partial S. asiatica resistance, were compared with the locally popular B22. Parasite emergence time, numbers, and seed bank sizes were recorded. In all CA practices S. asiatica infection was significantly reduced. Best results were obtained with Stylosanthes guianensis (CAST). This species also suppressed ordinary weeds much better than other cover crops. With CAST, average parasite emergence was delayed by 7.5 days (in rice) and 6.3 days (in maize) and infection levels were reduced by 79% (in rice) and 92% (in maize) compared to the conventional farmer practice (CONV). NERICA varieties delayed S. asiatica emergence by 5.7 days (NERICA-9) and 9.7 days (NERICA-4) and reduced infection levels by 57% (NERICA-9) and 91% (NERICA-4) compared to B22. In maize the residual effect of resistance of NERICA-4 resulted in a delay of 7.5 days in S. asiatica emergence and a reduction of 60% in parasite numbers. The best combinations delay S. asiatica emergence by 17.8 days (CAST + NERICA-9) and 19.1 days (CARB + NERICA-4) and reduce the parasite infection levels by 96% (CAST + NERICA-9 or −4) to 98% (CARB + NERICA-4) in rice, compared to CONV + B22. After two full rice-maize rotation cycles S. asiatica seed numbers in the soil (0–10 cm) were 76% (CACM), 78% (CAST) and 86% (CARB) lower than under CONV. Even the combination of zero-tillage, crop residue mulching, cover crops and resistant rice varieties does not entirely prevent S. asiatica parasitism and seed bank increase. Additional measures, targeted to escaping weeds, would be required for fully effective and long-term control. (Résumé d'auteur)

Mots-clés Agrovoc : Oryza sativa, Striga asiatica, Plante parasite, Culture sous couvert végétal, Paillage, Non-travail du sol, Variété, Rotation culturale, Zea mays, Mucuna pruriens, Stylosanthes guianensis, Vigna umbellata, Variété indigène, Vigna unguiculata, Plante de couverture, Évaluation, Efficacité, Désherbage, agriculture alternative

Mots-clés géographiques Agrovoc : Madagascar

Mots-clés complémentaires : Agriculture de conservation

Mots-clés libres : Parasitic weeds, Conservation agriculture, NERICA rice varieties, Mucuna, Stylosanthes, Legumes

Classification Agris : H60 - Weeds and weed control
F08 - Cropping patterns and systems
F07 - Soil cultivation
F30 - Plant genetics and breeding

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

  • Randrianjafizanaka Meva Tahiry, CIRAD-PERSYST-UPR AIDA (FRA)
  • Autfray Patrice, CIRAD-PERSYST-UPR AIDA (MDG)
  • Andrianaivo Alain-Paul, FOFIFA (MDG)
  • Ratsimiala Ramonta Isabelle, Université d'Antananarivo (MDG)
  • Rodenburg Jonne, Centre du riz pour l'Afrique (TZA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/586924/)

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