NUTRIMENTAL POTENTIAL OF RED DOLICHOS, BROWN DOLICHOS AND COWPEA FOR GREEN MANURE PRODUCED UNDER THREE TILLAGE SYSTEMS (POTENCIAL NUTRIMENTAL DE FRIJOL DOLICHOS ROJO, DOLICHOS CAFÉ Y YORIMON COMO ABONO VERDE PRODUCIDOS BAJO TRES SISTEMAS DE LABRANZA)

摘要: SUMMARY The nutrimental content of N, NO3-N, P, K, Mg, Ca, Mn, Zn, Cu, Fe, and B, was evaluated in three bean cultivars two species with potential to be used as green manure. Cultivars were the red lab-lab (RL) (Lablab purpureus), brown (BL) (L. purpureus) cowpea (CW) (Vigna unguiculata). Three tillage systems assayed: conventional (CT), minimum (MT) optimal (OT). Results showed that NO3, K did not evidence statistical differences (P≤0.05) among systems. However, greater N BL-CT 4.85%. P varied from 0.38 0.41% concentration 2.40 2.84%. Ca highest RL-OT 2.88%, while lowest percentage evidenced by CW-CT, 2.12% (P≤0.05). Mg appeared CW-OT 0.89% registered for BL-CT, showing 0.52% Fe observed 0.15% BLCT RL-CT, 0.10%. Mn significantly CW without concerning system 0.39% smallest obtained RL-MT 0.17%. greatest nutriment B BL-OT, CW-MT CW-OT, 0.024 0.030%. In contrast, found 0.015%. Zn respect cropping system; 0.0026% BL-OT 0.0040. Cu BL-MT, RLCT, RL-MT, being BL-MT combinations (0.0061%), 0.0048% 0.0044%, respectively.