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Tableau 1

Productions moyennes dans un échantillon de 20 parcelles selon leur note de végétation (les rendements (a) et (b), d’une part, et (c) et (d), d’autre part, sont significativement différents au seuil 0,01 %).

Average yields in a sample of 20 plots according to their vegetation score (yields [a] and [b] on the one hand, and [c] and [d] on the other hand, are significantly different at the 0.01% threshold).

    Densité de végétation   

    Faible Moyen Fort
  Nb de parcelles 8 5 7
  Surface totale 7,0 4,7 10,3
Sorgho (kg/ha) Grains 56 242 287
  Tiges 81 369 440
Niébé (kg/ha) Grains 90 182 167
  Cosses 27 55 50
Sorgho + Niébé (kg/ha) Grains 144(a) 424(b) 455(b)
      445(b)  
  Tiges et cosses 108(c) 424(d) 490(d)
      469(d)  

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