Browsing by Author "Bulyaba, Rosemary"

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    Genotype by Location Effects on Yield and Seed Nutrient Composition of Common Bean
    (Agronomy, 2020) Bulyaba, Rosemary; Winham, Donna M.; Lenssen, Andrew W.; Moore, Kenneth J.; Kelly, James D.; Brick, Mark A.; Wright, Evan M.; Ogg, James B.
    Common bean (Phaseolus vulgaris L.) is an important staple food crop in households worldwide. Genotype and location influence phenotypic nutrient composition. However, there are limited data on the magnitude of this variation for common bean yield and nutritive value. The objective of this study was to determine the effect of location on yield and seed nutritional composition. Four globally important varieties (dark red kidney/‘Montcalm’, great northern /‘Taurus’, black /‘Eclipse’ and yellow Mayocoba/‘MY06326’) were planted for two years in four locations (Iowa, Colorado, Michigan, in the USA, and Masaka, Uganda). Yield and seed weight differed among locations and varieties. Yield in Colorado and Michigan was 42% and 56% higher than in Iowa and 76% and 81% greater than in Uganda, respectively. Eclipse had greater yield than Taurus (6%), MY06326 (16%), and Montcalm (35%). Concentration of P, K, Mg, S, and crude protein (CP) differed among varieties. Montcalm had 18%, 7%, and 4% greater P concentration and 13%, 9%, and 5% greater CP than Eclipse, MY06326 and Taurus, respectively. The location × variety interaction was significant only for seed Zn concentration. Despite differences in edaphic factors among locations, elemental concentrations other than Zn were comparatively stable among locations. Stability in seed elemental concentrations across locations and environments is important knowledge for better understanding human nutrition and malnutrition.
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    Influence of Bradyrhizobium Inoculation and Fungicide Seed Treatment on Development and Yield of Cowpea, Lablab, and Soybean
    (Crop, Forage & Turfgrass Management, 2017) Bulyaba, Rosemary; Lenssen, Andrew W.
    Core Ideas Cowpea did not require Bradyrhizobium inoculation for nodulation. Lablab required Bradyrhizobium inoculation for nodulation. Fungicide seed treatment did not compromise nodulation of cowpea or lablab. Cowpea [Vigna unguiculata (L.) Walp.] and lablab (Lablab purpureus L.) are grain legumes with limited testing for grain, forage, and cover crop use in the US Corn Belt. We conducted a 2-year field study to determine the influence of Bradyrhizobium spp. inoculation and fungicide seed treatment on development, nodulation, and yield of selected grain legumes. Soybean [Glycine max (L.) Merr.] was included as a well-understood control. The experimental design was a randomized complete block in a factorial of four grain legumes with and without Bradyrhizobium spp. inoculation and a fungicide seed treatment. The cultivars used in the experiment were soybean P92Y82, cowpeas CA46 and Top Crop, and lablab Rongai. The seed treatments were fungicide, mefenoxam + fludioxonil (ApronMaxx), and Bradyrhizobium spp. inoculant. The two experimental sites had four blocks each year, every block consisting of 16 plots with different crop–fungicide–Bradyrhizobium combinations. Each crop had four treatments: fungicide only, Bradyrhizobium spp. inoculant only, fungicide + inoculant, and a control (with no fungicide or inoculant). Cowpea plants had numerous functional nodules (pinkish or reddish on the inside) in the absence of Bradyrhizobium spp. inoculation, but lablab never produced any nodules without inoculation. We found no significant effects of Bradyrhizobium spp. inoculation and fungicide seed treatment on cowpea, lablab, or soybean grain yield.