https://jrur.ut.ac.ir/.../article_57605_7d4bcda5fa8726ae8955fcd...۱۳۹۵/۹/۱۱ -
In fact, annually about 20 tons per hectare of soil are washed by the effect of water erosion in Iran. This means the loss of 76 kg of nitrogen, 24 kg phosphor...
علمی - پژوهشی