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Estimating and modelling productivity of mango trees from endogenous factors. A methodology set up and validated for african orchards . PoS2-14

Sarron J., Sané C., Diatta J., Faye E., Malézieux E.. 2018. In : Book of abstracts of the XV European Society for Agronomy Congress : "Innovative cropping and farming systems for high quality food production systems". Genève : Agroscope, p. 134-135. European Society for Agronomy Congress (ESA 2018). 15, 2018-08-27/2018-08-31, Genève (Suisse).

In the Niayes region located (Senegal), mango (Mangifera indica L.) crop is a main economical income for a variety of farms: from small family farms to large farms based on commercial monocrop orchards. Consequently, farming landscapes are made up of a mosaic of cultivated mango trees displaying strong variability in cultivars and tree structures. As a result, mango productivity is highly variable at different scales (tree, orchard, farm) and this variability has not been quantified and described yet, as in most African regions. Thus, accurate information on mango tree productivity and the endogenous factors that drive its variability is highly needed. The aim of this study was to quantify the production potential of mango trees and estimate it from easily measurable endogenous factors (cultivar, fruit load and structure of the tree). In 2017, a set of 300 trees were sampled to represent the in situ heterogeneity in tree structure (height and canopy volume) of the three main cultivars cultivated in the region: 'Kent', 'Keitt' and 'Boucodiékhal' (BDH). At harvest stage, the fruit load ¿ defined by the ratio between the surface of fruit and the surface of the overall. Overall, in the squares with oregano and St. John's wort, more than 50% were weeds. The costs of seeds and the manual work for ¿Country -Horse 2122¿ trial were 139 EUR per 100 m2, and for the mixture of oregano and St. John's wort - 208 per 100 m2. Freshly cut plants were fed to dairy cows: the animals were interested in the eating, also it was observed that the plants' mixture did not change the milk qualities (taste, odour, colour) negatively. The mixture ¿Country Horse 2122¿ can be recommended for farmers ¿ it can be sown also mechanized in lines. In this case the costs will be about 250 EUR per ha, but the yield can be cut in the year of sowing. Due to the needs of specific growing conditions, the use of oregano and St. John's wort in grassland may cause problems (the development of the plants is weak in the first year). The price of these seeds also is more expensive than for ¿Country - Horse 2122¿ mixture.

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