Varying effects of organic waste products on yields of market garden crops in a 4-year field experiment under tropical conditions

Diallo Falilou, Legros Samuel, Diarra Karamoko, Feder Frédéric. 2022. Varying effects of organic waste products on yields of market garden crops in a 4-year field experiment under tropical conditions. Agronomy (Basel), 12 (1), n.spéc.Organic Waste Recycling as Fertilising Practice in Agronomic Ecosystems:32, 16 p.

Résumé : Controlling organic and mineral fertilisation is a major concern in tropical environments. An experiment was conducted on an arenosol in the Dakar region, the main market gardening area of Senegal, to evaluate treatments commonly used by farmers. Seven treatments were repeated three times: A mineral fertilisation (MF) treatment based on N-P2O5-K2O (10-10-20), and three organic treatments at two doses (dried sewage sludge (SS), poultry litter (PL) and a digestate from an anaerobic digestion (AD) of cow manures). Each of the organic treatments were supplemented with a normal dose (1) and a double dose (2) of mineral N and K fertiliser. A lettuce, carrot and tomato rotation was grown in four campaigns (2016–2020) on all of the plots. Yields of all three crops in all of the organic treatments were statistically similar (p > 0.05) to the MF in all four campaigns, except for the yield of the lettuce crop under treatment PL-2 in campaigns 2 and 3. The tomato yields were statistically similar under all of the organic treatments in all four campaigns. In contrast, the yields of the lettuce and carrot crops differed statistically from each other and under the different organic treatments in all four campaigns. The yields of all three crops differed in the campaigns with the fertilisation treatment. In each campaign, the yields of each crop were not correlated with the total amounts of N, P and K applied. These differences or similarities in yields are explained by the nature of the organic waste products, the accumulation of nutrients after several applications, the type of crop and interannual differences in temperature.

Mots-clés Agrovoc : rendement des cultures, culture maraîchère, fertilisation, engrais organique, engrais minéral, Arénosol, amendement organique, déchet organique, rotation culturale, zone tropicale

Mots-clés géographiques Agrovoc : Sénégal

Mots-clés libres : Lettuce, Carrot, Tomato, Arenosol, Waste recycling

Classification Agris : F04 - Fertilisation
F08 - Systèmes et modes de culture

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Diallo Falilou, CIRAD-PERSYST-UPR Recyclage et risque (SEN)
• Legros Samuel, CIRAD-PERSYST-UPR Recyclage et risque (SEN) ORCID: 0000-0001-7081-6679
• Diarra Karamoko, UCAD (SEN)
• Feder Frédéric, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0001-8434-5193 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/599928/)

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