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Symbiotic performance,shoot biomass and water-use efficiency of three groundnut(Arachis hypogaea L.)genotypes in response to phosphorus supply under field conditions in Ethiopia

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Frontiers of Agricultural Science and Engineering 2020年第4期7卷 455-466页

作者： Sofiya KMUHABA Felix DDAKORA Department of Soil Fertility and Health Management Debre Zeit Agricultural Research CenterEthiopian Institute of Agricultural ResearchPO Box 32Debre ZeitEthiopia Department of Crop Sciences Tshwane University of TechnologyPrivate Bag X680Pretoria 0001South Africa Department of Chemistry Tshwane University of TechnologyArcadia CampusPrivate Bag X680175 Nelson Mandela DrivePretoria 0001South Africa

Phosphorus is a key nutrient element involved in energy transfer for cellular metabolism,respiration and photosynthesis and its supply at low levels can affect legume nodulation,N2 fixation,and C assimilation.A twoyear field study was conducted in Ethiopia in 2012 and 2013 to evaluate the effects of P supply on growth,symbiotic N2 nutrition,grain yield and water-use efficiency of three groundnut *** P to the genotypes significantly increased their shoot biomass,symbiotic performance,grain yield,and C *** was,however,no effect on shootδ13C values in either *** to the zero-P control,supplying 40 kg$ha–1 P markedly increased shoot biomass by 77%and 66%in 2012 and 2013,*** both years,groundnut grain yields were much higher at 20 and 30 kg$ha–1 *** supply markedly reduced shootδ15N values and increased the%ndfa and amount of Nfixed,indicating the direct involvement of P in promoting N2 fixation in nodulated *** three genotypes differed significantly inδ15N,%ndfa,N-fixed,grain yield,C concentration,andδ*** phosphorusgenotype interaction was also significant for shoot DM,N content,N-fixed and soil N uptake.

关键词： shoot yield N-fixed %ndfa δ15N δ13C water-use efficiency

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