Bøger af Saied El Sayed

Agriculture is subject to significant challenges due to the high population, corresponding increases in food demand and limited arable land, as well as many vital and non-vital pressures, which continue to affect agricultural productivity. Drought as a non-vital stress is one of the most serious challenges facing sustainable agriculture, resulting in a significant lack of crop productivity. Drought is a natural phenomenon that is released and sustained over a long period due to insufficient availability of fresh water for human needs and ecosystems. Drought stress has become a major challenge for agriculture around the world, posing a major threat to food security as well as to the growth and productivity of major crops. Drought is often accompanied by adverse effects leading to many physiological and morphological changes. Water stress works on vital changes, including accumulation of Abscisic acid and proline, which leads to wilting, at which point it will be a higher consumption of oxygen gas and formation of ascorbate and glutathione compounds that increase the negative impact on growth and plant cell composition.

The natural environment for plants is composed of a complex set of abiotic stresses and biotic stresses. Plant responses to these stresses are equally complex. All environmental factors that influence plant growth potentially can affect the ability of crops to exploit the environmental resources for which plants compete. Mineral nutrition of plants plays a critical role in increasing plant resistance to environmental stresses. Among the mineral nutrients, potassium is essential for many physiological processes, such as photosynthesis, activation of enzymes under stress conditions. Protein and starch synthesis in plants require potassium as well. Potassium is essential at almost every step of the protein synthesis. In starch synthesis, the enzyme responsible for the process is activated by potassium. Potassium (K), along with nitrogen (N) and phosphorus (P), is an essential plant macronutrient that is taken up by crops from soils in relatively large amounts. Potassium increases both the yield and quality of agricultural produce, and enhances the ability of plants to resist diseases, insect attacks, cold and drought stresses and other adverse conditions.