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Sols agricoles et pollution diffuse
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ISBN10: 6630112598
ISBN13: 9786630112597
Publisher: Editions Universitaires Europeennes
Published: Jul 10 2026
Pages: 108
Weight: 0.34
Height: 0.26 Width: 6.00 Depth: 9.00
Language: French
ISBN13: 9786630112597
Publisher: Editions Universitaires Europeennes
Published: Jul 10 2026
Pages: 108
Weight: 0.34
Height: 0.26 Width: 6.00 Depth: 9.00
Language: French
La plaine des Triffa, située à l'extrémité du Maroc oriental sur la rive droite de la basse Moulouya, s'étend sur 61 000 ha, dont 36 000 ha irrigués. Les sols, à texture limono-argilo-sableuse équilibrée, présentent un pH moyen voisin de 8, témoignant d'une tendance alcaline liée à une richesse en calcaire total (6,21 %) et en calcium échangeable (4,68 mg/kg). La salinité moyenne de l'extrait saturé est de 3,86 mmhos/cm, classant les sols comme non salins à moyennement salins, avec des zones salines localisées. Les teneurs moyennes en matière organique (3,06 %) et en carbone organique (1,77 %) indiquent une fertilité moyenne, favorisée par une activité bactérienne intense sous irrigation gravitaire. L'azote total atteint 0,14 %, mais les pertes par lessivage des nitrates (422 mg/kg) vers les nappes sont massives, compensées par un recours important aux engrais azotés (ammonitrate 33,5 % pour 46 % des apports). Le rapport C/N proche de 10 et la saturation calcique caractérisent un mull calcique, humus neutre et structurant.Les sols sont pauvres en phosphore total (101 mg/kg) et en orthophosphates (40 mg/kg), justifiant une fertilisation phosphatée.
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