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

Autor: Isabelle Ratsimiala Ramonta, Meva Tahiry Randrianjafizanaka, Patrice Autfray, Alain Paul Andrianaivo, Jonne Rodenburg
Rok vydání: 2018
Předmět:
0106 biological sciences
Crop residue
Rotation culturale
F08 - Systèmes et modes de culture
Vigna umbellata
H60 - Mauvaises herbes et désherbage
01 natural sciences
Non-travail du sol
Désherbage
F30 - Génétique et amélioration des plantes
agriculture alternative
Cover crop
Mucuna pruriens
F07 - Façons culturales
Ecology
biology
Stylosanthes guianensis
04 agricultural and veterinary sciences
Tillage
Vigna unguiculata
S1
food.ingredient
Oryza sativa
Paillage
Zea mays
Culture sous couvert végétal
No-till farming
food
Plante de couverture
Variété indigène
Variété
Efficacité
Striga asiatica
biology.organism_classification
Plante parasite
Agronomy
Évaluation
040103 agronomy & agriculture
0401 agriculture
forestry
and fisheries
Animal Science and Zoology
Weed
Agronomy and Crop Science
Mulch
010606 plant biology & botany
Zdroj: Agriculture, Ecosystems and Environment
ISSN: 0167-8809
DOI: 10.1016/j.agee.2017.12.005
Popis: 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.
Databáze: OpenAIRE
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