Competitive interactions, resource use and nitrogen dynamics in annual intercrops in low-input cropping systems [including 5 papers and a synthesis]

agricultura de bajo insumo agriculture faible niveau intrants azote cropping systems cultivo intercalado culture intercalaire cycle de l'azote facteur de rendement factores de rendimiento feed crops fixation de l'azote hordeum vulgare intercropping low input agriculture malezas mauvaise herbe nitrogen nitrogen cycle nitrogen fixation pisum sativum plant competition plantas forrajeras root systems sistema radicular sistemas de cultivo weeds yield factors