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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 genotypes. Supplying P to the genotypes significantly increased their shoot biomass, symbiotic performance, grain yield, and C accumulation. There was, however, no effect on shoot δC values in either year. Compared to the zero-P control, supplying 40 kg$ha P markedly increased shoot biomass by 77% and 66% in 2012 and 2013, respectively. In both years, groundnut grain yields were much higher at 20 and 30 kg$ha P. Phosphorus supply markedly reduced shoot δN values and increased the %Ndfa and amount of Nfixed, indicating the direct involvement of P in promoting N2 fixation in nodulated groundnut. The three genotypes differed significantly in δN,%Ndfa, N-fixed, grain yield, C concentration, and δC. The phosphorus genotype interaction was also significant for shoot DM, N content, N-fixed and soil N uptake.

frontiers of agricultural science and engineering

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