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.
Central Asia Atlas of Natural Resources. Once a region shrouded in mystery and best known for its trans-Asian commerce via the Silk Road, Central Asia today is an open, dynamic region connecting Eastern Europe with West Asia. It is a region rich in natural resources, including oil and gas, with a surprising variety of animals and plants. The Atlas brings readers a sense of beauty and wealth in Central Asia, the issues its people face in using and conserving natural resources, and the efforts and progress towards sustainable development.