Only 16 or so elements are truly essential for plant growth. The rest of the elements present in plant tissue are largely taken up in small quantities incidentally (or accidentally!) as plants take up the nutrient elements that they need for growth and reproduction.
Turkey has the largest economy in the region, followed by Saudi Arabia and Iran. Petroleum is the major industry in the regional economy, as more than half of the world's oil reserves and around 40 percent of the world's natural gas reserves are located in the region.
The Southeast Asia subregion with an area of 1 939 230 km 2, or 9.5 percent of the total area of the region, is composed of Myanmar and the four riparian countries of the lower Mekong Basin (Cambodia, Thailand, Viet Nam and Lao PDR).he region is characterized by a low percentage of water resources shared by several countries (1.7 percent of the regions total water resources). Overall, the region is relatively well endowed with water resources, receiving 1.4 percent of the worlds precipitation and generating 1.8 percent of its water resources.