Bean yield loss assessment trials in Uganda
1990
Kisakye, J. | Ugen-Adrogu, M.
Diagnostic surveys were conducted in Luwero, Mpigi, Rakai and Kabale Districts to identify the farmers' major problems in bean production. Soil infertility, beanfly damage, use of unimproved cultivars and disease were among the priority problems. To determine the importance of the various production constraints, exploratory trials were conducted on farmers' fields during the two wet seasons of 1988. An incomplete factorial (plus one) design was used to investigate the effects of fertilizer (nitrogen and phosphorus) application, beanfly control, the use of the recommended variety (K20) and the control of fungal diseases, on bean seed yield. The fertilizer was applied at the rate of 33 kg N plus 25 kg P205/ha. Endosulfan was used to control beanflies. Partial control of fungal diseases was achieved by seed dressing with Thiram and Benlate. The variety K20 was compared with farmers' cultivars to determine varietal effects. The greatest yield loss, over 50 percent, was due to either nitrogen or phosphorus deficiency or a combination of the two. Seed dressing with insecticide and fungicide resulted in increased yields but the differences were not statistically significant. Generally, K20 was not superior to farmers' cultivars
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