Salinity is one of the damaging environmental factors that reduce plant productivity. (Shahbaz et al., 2011, 2012; Adebooye et al., 2012; Perveen et al., 2012). Around the world, 5% of arable land is affected by salt stress (D. Molazem, EM Qurbanov and SA Dunyamaliyev, 2013). Salinity affects the world's drylands by 2.1% (FAO 2003). Arid and semi-arid regions are affected by salinity due to limited precipitation, high evapotranspiration and high temperatures, low soil osmotic potential and poor management (Azevedo Neto et al., 2006). 6.8 million hectare area of ​​Pakistan affected by salinity. There are many types of stress in the world, but the most important is salinity stress (Amirjani, 2011) which occurs due to the accumulation of high concentration of sodium and chloride ions in plants , which causes harmful effects on plants. growth (Shahbaz and Zia, 2011; Shahbaz and Ashraf, 2013). High sodium concentration leads to a reduction in potassium ions (Naheed et al., 2008; Shahbaz et al., 2013). Sodium chloride enters plant roots through its symplasmic transport, the Casparian strip and its transfer into the transpiration stream (Kanwal et al., 2011). Salt stress causes osmotic stress, ionic toxicity, oxidative stress and nutritional imbalance in plants (Habib et al., 2010). Under saline conditions (Moffat, 2002), water absorption by roots slows down, resulting in low osmotic potential (Supper, 2003). The osmotic potential also slows down by the accumulation of certain solutes such as proline and soluble sugars (Youssef and Al-Fredan, 2008). Proline and soluble sugars increased with increasing sodium chloride concentration (Fozouni et al., 2012). Sugars, in addition to their role as regulators of osmotic balance, also act as...... middle of paper ......photorespiration. In corn, a large amount of soluble sugars and proline accumulate, and the number of amino acids and proteins decreases. There are many mechanisms to achieve high maize yield by planting at the appropriate time (Anapalli et al., 2005). Photoperiod and temperature are two important factors when sowing. Planting date and varietal selection are the main factors affecting maize production, in addition to soil fertility and irrigation (Ramankutty et al., 2002). It is better to plant corn earlier due to using the entire growing season, reaching physiological maturity before frost and adequate drying; thereby increasing profits through reduced drying costs while delays in sowing date reduced individual grain weight. Maize yield can be increased by planting high yielding varieties at the appropriate time (Khan et al., 2009; and Arif et al.., 2001)