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05%) affected by monoculture or intercropping with various field bean densities.
Keywords: Sweetpotato, field bean, Land Equivalent Ratio, intercropping, mineral concentration, soil chemical properties
Field bean, commonly known as sugar bean in Swaziland, is the second most important pulse after peanut (Thwala and Ossom, 2004).
This investigation was undertaken to determine the influence of different field bean population densities on intercropped sweetpotato yields when the latter is planted at a constant density, LER, mineral concentration in sweetpotato tubers and chemical properties of the soil.
Table 1 shows the effect of field bean population density on tuber yield of sweetpotato and pod yield of field bean.
LER for intercropped sweetpotato and field bean ranged from a low of 1.
Disease infestation did not significantly vary between the field bean populations (Table 1).
Diseases have been reported to be the leading constraint to increased field bean production throughout the world (Kelly & Miklas, 2005).
It should be borne in mind that the ecological situations in mixed cropping are often quite different from those in sole cropping, the cropping system that we used when studying field bean populations.
Soil temperature (Table 4) did not show any significant differences between field bean populations.
Figure 1 shows the seed yield (dry mass) of field bean.
05 level of significance, there was a trend toward fewer weeds when the field bean plant canopy closed from 3 to 6 WAP.