Fig. 6. CVA ordination diagram of the weed flora at 6 weeks after planting in mixed groundnut–cassava–maize fields established after clearing three different short-fallow types at Mengomo, southern Cameroon in 1999. Species are coded as: Age con = Ageratum conyzoides; Ane ben = Aneilema beninense; Chr odo = Chromolaena odorata; Cos afer = Costus afer; Cyp rot = Cyperus rotundus; Cyp sp = Cyperus sp; Dio sca = Diodia scandens; Hau dan = Haumania danckelmaniana; Ipo inv = Ipomoea involucrata; Mac ass = Macaranga assas; Mik cor = Mikania cordata; Mus cec = Musanga cecropioides; Opl bur = Oplismenus burmannii; Pas con = Paspalum conjugatum; Phy ama = Phyllanthus amarus; Pip umb = Piper umbellatum; Pla afri = Plagiostyles africana; Scl boi = Scleria boivini; Sid rho = Sida rhombifolia; Sta cay = Stachytarpheta cayennensis; Tal tri = Talinum triangulare; Tre ori = Trema orientalis; Tri cor = Triumfetta cordifolia; Tri mau = Tristema mauritiana; Ver con = Vernonia conferta; Xan sag = Xanthosoma sagittifolium. Soil variables are indicated as BULK = bulk density; CLAY = clay content; SAND = sand content; SIILT = silt content; N, C, C:N (C:N ratio), P, pH, Mg, Ca, K, and Al.