Fig. 3

Grain yield variations under effects of DAP dose (a), plant density (b), interaction DAP dose × variety (c), and across seasons and years (d) in Miti, Kabare, eastern DRC. E1, E2, E3: plant densities corresponding to: 100,000, 166,666 and 250,000 plants ha−1, respectively, ADEI and C.R are variety names, A and B refer to the long and short cropping seasons in the study area, respectively