A study in Upper Egypt looked at how different levels of nitrogen fertilizer affected maize growth and yield when grown alone or with green beans. They found that using 150 kg of nitrogen per acre led to the highest maize yield and quality, especially when intercropped with green beans. This method also saved land and increased crop water productivity. Intercropping maize with green beans and using the right amount of nitrogen fertilizer can help farmers increase their yields and make better use of resources.