La pastèque ou « Kankana » en Haoussa connue scientifiquement sous le nom « Citrullus lanatus » est une cucurbitacée cultivée principalement pour sa chaire sucrée et très hydratante. Sa production et sa conservation nécessite le suivi d’un itinéraire technique adéquat.
Yélian Martine AWELE
La pastèque est « une culture très exigeante en éléments fertilisants surtout en potasse. Elle est peu exigeante en sols mais le terrain doit être bien composté et drainé de sorte que le sol soit toujours humide. Par contre, les altitudes supérieures à 1300 m ne lui conviennent pas beaucoup.
La plante contient 93{e43727ebdf1c82cdaf05db1b2e953f1c6b388407dfc0230603c9b856384b4112} d’eau. Elle est donc une plante qui aime l’eau mais les apports devront être contrôlés pour que la plante donne de gros fruits », note Bénin Fruits & Fleurs. Sa production est conditionnée par le respect d’éléments techniques bien-définis.
Itinéraires techniques
La préparation du sol : elle doit se faire peu avant l’arrivée des premières pluies. Selon les spécialistes, cette activité consiste à désherber, abattre, tronçonner et dégager le site. L’abattage doit se faire de manière systématique car la pastèque n’aime pas l’ombre. Il est important de piqueter la parcelle en respectant des écartements de 2 m x 1 m (soit 5000 plants par hectare) si l’on utilise les variétés compo-composites et 2 m x 2 m (soit 2500 plants par hectare) si on utilise les variétés hybrides ; creuser un trou à l’emplacement de chaque piquet d’environ 60 cm de diamètre et 40 cm de profondeur ; séparer la terre de surface (terre noire) avec celle du fond ; mélanger ensuite la terre noire avec de la fientes de poulet ou du compost à raison de 2 à 3 kg/poquet sur un sol à texture sableuse riches en matières organiques.
Le semis se fait généralement en fin mars avec les variétés locales nommées « Fara, bakka », selon la couleur des fruits qui signifie blanc et noir. Pour 1 ha, il faut 1 kg ; 3 à 4 graines par trou avec une fumure de fond de 20 charrettes de fumure organique bien décomposée (soit environ 8 tonnes), en apport localisé par trou. Fumure d’entretien : 2 apports d’engrais minéral NPK (15-15-15). Le premier apport se fait après la levée (stade 3 feuilles), une pincée de 3 doigts par poquet ; le deuxième s’applique au début ramification, une pincée de 5 doits par poquet. Aussi, pour permettre à la pastèque de bien se développer, il faut l’irriguer 5 fois par semaine. Il faut également accorder un bon entretien aux cultures. Le sarclage, le démariage et l’éclaircissement (la réduction des fruits) constituent les principales activités d’entretien de la culture. Le désherbage s’effectue manuellement avec la daba.
Par ailleurs, la pastèque est moins sensible en saison sèche chaude et est souvent exposée aux ravageurs : pucerons (dankono) et chenilles. Ainsi, faille-t-il observer les mesures d’atténuation comme : les traitements phytosanitaires ; les bonnes pratiques agricoles (nettoyage, assolement / rotation, etc.).
Quant à la récolte, elle se fait à partir de fin mai, (2 mois après le semis) et s’étend jusqu’au mois de juillet.
Pour récolter, « on enlève les fruits qui sont mûrs. Pour apprécier la maturité des fruits, les producteurs procèdent par plusieurs systèmes, soit en tapotant sur le fruit (plus le fruit est léger plus il est mûr) ; soit en observant les rayures qui sont sur le fruit (quand les rayures deviennent plus claires le fruit est mûr).
Selon le rapport de la Chambre Régionale d’Agriculture de Dosso, publié en 2017, « En moyenne, pour 1 ha, une production de 11 tonnes permet de dégager un produit brut de 1.785.000 F.CFA pour 235.000 F.CFA de charges et donc une marge brute de 1.550.000 F.CFA et un ratio produits/charges supérieur à 2 ».
La pastèque peut être conservée une semaine, de préférence dans un endroit frais et bien aéré. Si la pastèque est entamée, il urge de protéger sa chair avec du film alimentaire pour éviter qu’elle s’abîme et qu’elle s’assèche.
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