Nitrogen Use Efficiency Across the World (image) Princeton University, Woodrow Wilson School of Public and International Affairs Share Print E-Mail Caption This chart reflects nitrogen use efficiency and crop yields across the globe. Between 1961 and 2011, France and the United States have more efficiently used fertilizer all while producing large amounts of crops. On the other extreme, India and China have inefficiently used fertilizer, causing significant pollution, but have still produced high crop yields. In Sub-Saharan African countries like Malawai, fertilizer use has been extremely low, which has led to low crop yields. Credit Xin Zhang, Princeton University Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.