This study was designed to investigate the effects of and sp. co-inoculation coupled with N application on soil N levels and N in plants (total N, nitrate N-NO and ammonium N-NH), photosynthetic pigments, cowpea plant biomass and grain yield. An isotopic technique was employed to evaluate N fertilizer recovery and derivation. Field trials involved two inoculations-(i) single sp. and (ii) sp. + co-inoculation-and four N fertilizer rates (0, 20, 40 and 80 kg ha). The co-inoculation of sp. + increased cowpea N uptake (an increase from 10 to 14%) and grain yield (an average increase of 8%) compared to the standard inoculation with sp. specifically derived from soil and other sources without affecting N fertilizer recovery. There is no need for the supplementation of N via mineral fertilizers when co-inoculation is performed in a cowpea crop. However, even in the case of an NPK basal fertilization, applied N rates should remain below 20 kg N ha when co-inoculation with sp. and is performed.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9321259 | PMC |
| http://dx.doi.org/10.3390/plants11141847 | DOI Listing |
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