Resumen
- In order to evaluate breeding lines for tolerance to iron toxicity tolerance we are continuing to refine a method using acid soil from Santander de Quilichao in concrete tanks. In 1998, we lined the tanks with black plastic to reduce leaking. We divided the tanks into 8 equal sub-tanks. The 8 tanks were flooded 4 and 2 weeks before planting, at the same time of planting, or two weeks after planting with two replications. Thirteen different varieties were planted including resistant, intermediate, and susceptible checks. Visual scoring was done at ten day intervals beginning at 30 DAP (days after planting) until 50 DAP. The results of the evaluations at 40 DAP are shown in Table 1. BR-IRGA 410 and PNA 343 showed consistent susceptibility, whereas CIA 8, Metica-1 and CT 9155-2 were resistant. The results of the test in 1998, however, did not match with data from other tests.