Responses of Dry Beans to Varying Nitrogen Levels
1975
Edje, O. T. | Mughogho, L. K. | Ayonoadu, U. W. U.
Dry beans (Phaseolus vulgaris L.) are poor nitrogen fixers; therefore, nitrogen fertilizers are recommended for even reasonable production. We studied the effects of six levels of nitrogen (0, 40, 80, 120, 160 and 200 kg/ha) on determinate dry bean yields for 2 years. Seed yields increased significantly in both years with increasing rates of N. Average yields were 2,150, 2,704, 3,048, 3,147, 3,366 and 3,779 kg/ha, respectively, for the six rates of N indicating that higher rates of N might have produced greater seed yields. Yield components (yield/plant, pods/plant, seed/size) also increased with increasing N. Percent crude protein and crude protein yield were closely related to the amount of N applied. Leaf area index, canopy height, canopy width, plant height, and pod length were significantly affected by the amount of N applied; however, addition of N had no appreciable effect on specific leaf area and leaf area ratio. Nitrogen increased dry matter production but had no effect on the distribution of dry matter. At 50 days from planting, dry matter was highest in leaflets (47.7%) followed by stems (28.9%) and was least in flowers (1.2%).
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