Evaluation of white yam (Dioscorea rotundata) genotypes for Arbuscular mycorrhizal colonization, leaf nutrient concentrations and tuber yield under NPK fertilizer application
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Dare, M.O., Fagbola, O., Abaidoo, R. & Asiedu, R. (2014). Evaluation of White yam (Dioscorea rotundata) genotypes for arbuscular mycorrhizal colonization, leaf nutrient concentrations and tuber yield under NPK fertilizer application. Journal of Plant Nutrition, 37(5), 658-673.
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Yield decline in yam may not only be due to soil nutrient depletion but also to the activity of soilmicroflora. Arbuscular mycorrhizal (AM) symbiosis helps in plant nutrition but may be affected bythe application of fertilizer. The effects of nitrogen (N), phosphorus (P), and potassium (K) fertilizerrates on the AM colonization, leaf nutrient concentrations, and tuber yields of eleven genotypes ofDioscorea rotundata were investigated at Ibadan, Nigeria. The soil was ferric luvisol. Elevengenotypes were selected from the previously conducted screening of 75 genotypes of D. rotundata forfertilizer response. Four application rates: 0, 200, 400, and 600 kg ha?1 of NPK 15-15-15 wereapplied in a split plot design with four replications. Fertilizer rate was the main plot and varietywas the sub plot. Percentage AM colonization was significantly reduced at 600 kg ha?1 but not atlower rates when compared to zero rate and it was negatively correlated with leaf N, P, and zinc (Zn)concentrations. Leaf N concentrations were significantly increased at 200 kg ha?1 in five genotypesand at 600 kg ha?1 in two genotypes compared to zero application. Leaf P and K concentrationswere decreased with the application of fertilizer in most of the genotypes. The NPK fertilizer of 15-15-15 at the rate of 200–400 kg ha?1 gave yield response in eight genotypes of D. rotundata, withminimal or no effect on their AM colonization when compared to zero application. Long term studyon the effect of fertilizer application on AM symbiosis in yam is recommended.