Ibrahim S. M. Mosaad , Ayman H. I. Serag, Mohamed Moustafa-Farag, , and
Ali K. Seadh
( 2019). Effect of exogenous proline application on maize yield and The optimum rate of mineral nitrogen under salinity stressJOURNAL OF PLANT NUTRITION 2020, VOL. 43, NO. 3, 354–370
Abstract: Salinity is a negative abiotic stress that produces drastic disorders on soils and plants causing a critical reduction in plant growth and yield parameters, particularly maize plant, which considers a moderately sensitive plant
to soil and water salinity. Although proline and nitrogen are well known to protect plants and improve their tolerance against various abiotic stresses including salinity, the interaction between proline and nitrogen fertilizer under saline conditions remained unclear. Two field experiments were conducted, on a clay saline soil in a split-plot design with four replicates. The main plots were arranged to study the effect of exogenous of proline applications at 0, 50 and 100mM during seedling and vegetative stages, and mineral of nitrogen fertilization rates were 0, 140, 280, and 420 kg N ha_1 occupied the subplots. A significant response to fertilizer N was observed at 420 kg ha_1, while the optimum N rate of 50mM of proline was 410.3 kg ha_1 and the economic optimum dose was 403.43 kg ha_1. Therefore, we recommend using 403.43 kg N ha_1 to get an optimum economic yield of maize, especially in saline soil, when used 50mM exogenous of proline at seedling and vegetative stages.
Keywords: (exogenous of proline; maize; N rates; nitrogen efficiency; optimum N rate; saline soil)
