List of Articles Urea. Open Access Article Abstract Page Full-Text 1 - Effects of Chemical and Organic Fertilizers on Nitrogen and Phosphorus Efficiency in Purslane (Portulaca oleracea) Seyfollah Fallah Fallah Behjat Omrani Omrani Open Access Article Abstract Page Full-Text 2 - Response of Effective Parameters of Wheat (Triticum aestivum L.) Yield to Apply Amino Acid and Nitrogen Chemical Fertilizer Mohammad Hossein Ghanavati Shahram Lack