Modeling the functional role of the microorganisms in the daily exchanges of carbon and nitrogen in intercropping system under Mediterranean conditions
¹Ecole Nationale Supérieure Agronomique, Département de Productions Végétales. Laboratoire d’Amélioration Intégrative des Productions Végétales (C2711100). Rue Hassen Badi, El Harrach DZ16200 Alger, Algérie
²University of Russia (RUDN University) Department of AgroBiotechnology, Institute of Agriculture,Peoples' Friendship, 6 Miklukho-Maklaya street, RU117198 Moscow, Russia
³Ecole Supérieure des Sciences de l'Aliment et des Industries Agroalimentaires (ESSAIA), Avennue Ahmed Hamidouch Route de Beaulieu, El Harrach, DZ16200 Alger, Algérie
Carbon (C) and nitrogen (N) sequestration in plants and soil micro-organisms is considered as a major phenomenon against global warming. The modeling of this phenomenon aims at highlighting the role that the legumes-cereals mixed crop can play in the reduction of greenhouse gases. It is based on field experiments in maize (Zea mays L.)-common bean (Phaseolus vulgaris L.) intercropped system of the cereal agroecosystem in Setif region of Algeria. For this purpose, the MOMOS model was selected and validated in a calcareous soil and low phosphorus (P) conditions. It revealed some mechanisms that control the C and N sequestration in the compartments of the complex soil-plant-atmosphere-microorganism system. CN modeling results show that the daily growth of intercropped maize with common beans is positively correlated with the microbial CN transformation during the cropping cycle, under limited P and N conditions. Thus, this approach revealed the functional role of rhizobial symbiosis in maintaining the balance between the different C and N exchanges from soil to atmosphere and from atmosphere to soil.