Asian Journal of Plant and Soil Sciences

Saline soils are impeding plant growth, necessitating the exploration of novel methods to enhance the resilience of plants, particularly those that are sensitive, such as snap bean. So, two field experiments were conducted under saline conditions during the two successive winter seasons of 2021 and 2022. Experiments were lead under split plot design with three replicates  and three nitrogen fertilizer rates Vz;100% of the recommended mineral N (RD-N), 75% RD-N+ Rhizobium inoculant (Bio-N) and 50% RD-N+ Bio-N as the primary plots and four amino acids as foliar application treatments (control, cysteine, arginine and proline) as the sub plots. The effect of the treatments and their interaction on growth, yield and yield components of snap bean plants (Phaseolus vulgaris L.) cv. Nebraska was investigated. After harvesting, available N in the experimental soil was determined. The results attained could be summed up as follows: 75% RD-N+ Bio-N compared to the other nitrogen fertilizer rates, achieved the highest values for all studied parameters. Amino acids foliar applications reduced the adverse effect of salinity on snap bean and the superior one was proline. The interaction between 75% RD-N+ Bio-N and proline implemented the maximum levels for the snap bean plant's vegetative growth parameters, yield and yield components. In the soil, the highest residual nitrogen (mg kg^-1) was  found in the treatment  where 75%RD-N+Bio-N and no foliar amino acids  was applied. Economically, the application of 75% RD-N+ Bio-N and  foliar proline treatment could be a good substitute for other treatments and a practical choice for increasing agricultural output and farmers' revenue.