مروری بر تاثیر عناصر ریز مغذی بر گیاهان دارویی تحت شرایط نامساعد خاکی

Obvious side effects of chemical drugs in the world has caused increased attention to the treatment plant. At the moment hundreds of hectares of farm land in developed countries and even Iran Is dedicated to cultivation of medicinal plants. Studies by researchers, the positive effect of micronutrients such as zinc and iron fertilizer on increasing yield, yield components and quality of medicinal plants has approved. Due to the more calcareous agricultural soils in Iran, high levels of pH, lack of nutrients and organic matter content is low enough available to plants, produce in this type of soil is faced with major problems.The high concentration of calcium ion and alkaline soil environment has led to some of the nutrients that they absorption is controlled by the soil pH, change to form insoluble complexes and become useless to the roots of plants. The high bicarbonate ions in calcareous soils, increase soil pH, reduced availability of micronutrients, especially zinc and iron by the plant. Thus, under conditions of limited nutrient uptake by the root, foliar application can be effective to eliminate nutrient deficiency.