Diagnosis and Recommendation Integrated System (DRIS) in Determining Mineral Status of Cotton in the Cotton Zones of Benin
Isidore Amonmidé *
Agricultural Research Center for Cotton and Fibers (CRA-CF), National Institute of Agricultural Research of Benin (INRAB), 01 PB 175 Cotonou, Republic of Benin and Department of Natural Resources Management, Laboratory of Hydraulics and Environmental Modeling (HydroModE-Lab), Université de Parakou, 03 BP: 351 Université, Parakou, Benin.
Gustave D. Dagbénonbakin
National Institute of Agricultural Research of Benin (INRAB), 01 P.O.Box 884, Cotonou, Republic of Benin.
P. B. Irénikatché Akponikpè
Department of Natural Resources Management, Laboratory of Hydraulics and Environmental Modeling (HydroModE-Lab), Université de Parakou, 03 BP: 351 Université, Parakou, Benin.
Emile C. Agbangba
Ecole Polytechnique d’Abomey-Calavi, University of Abomey-Calavi (UAC), Republic of Benin.
Pierre G. Tovihoudji
Department of Natural Resources Management, Laboratory of Hydraulics and Environmental Modeling (HydroModE-Lab), Université de Parakou, 03 BP: 351 Université, Parakou, Benin.
*Author to whom correspondence should be addressed.
Abstract
This study aimed at developing parameters of the Diagnosis and Recommendation Integrated System (DRIS) model for the assessment nutrient status for cotton grown in Benin.. Soil physical and chemical characteristics, leaves nutrient content (N, P, K, Ca, Mg) and seed-cotton yield were assessed on samples gathered from 150 farmers’ fields in 2018. Nutrient indices were computed using standard DRIS procedures. Results showed that phosphorus was in excess in the petiole and the whole leaves but in deficit in the limb. Potassium content was adequate according in the petiole and leaves but deficient in the limb. Ca content was limiting in the limb or the whole leaves and adequate in the petiole. Based on the diagnosis made in the petioles, Mg was deficient while adequate in the limbs and leaves. In the limb, the order of the macronutrients is as follows: K> P> N. On the other side, in the petiole and the whole leaves, the order of the macronutrients becomes: P> K> N. In the whole leaves and limb, the order of the secondary elements is as follows: Mg> Ca, whereas in the petiole the order of the secondary elements becomes: Ca> Mg.
Keywords: DRIS, nutrient balance, leaf organs, soil fertility, cotton, yield.