Synergistic Effects of Magnesium Sulfate and Compost on Improving the Productivity of Date Palm Under Drought Stress

Abstract

Drought is one of the most significant environmental stress factors negatively affecting fruit tree cultivation because they are highly water-dependent. Water shortage adversely affects the growth and development of fruit trees, leading to a severe reduction in productivity and fruit quality. In particular, drought harms photosynthesis, which is essential to produce carbohydrates. Therefore, developing mitigation strategies and effective water management is vital for maintaining fruit tree health and sustainability. This study was conducted to investigate the influence of adding soil compost individually and in combination with spraying of magnesium sulphate (MgSO₄) on improving the soil fertility, productivity, and fruit quality of date palm cv. Barhi. The date trees were fertilized with 5 and 10 kg of compost, and then they were sprayed with 0.5, 0.75, and 1 % MgSO₄ four times: starting from mid-February with one-month intervals between sprays, as compared to untreated trees as a control. The results revealed that combining soil-applied compost with foliar spraying of MgSO₄ enhanced the productivity and fruit quality of date palm. The best results were obtained by adding 10 kg compost + 1% MgSO₄, followed by 10 kg compost + 0.75% MgSO₄ and 5 kg compost + 1%  MgSO₄.