By Conor Humphries MYKOLAIV, Ukraine (Reuters) – As 10-metre high mounds of sunflower meal smoulder among the blackened ruins of one of Ukraine’s top agricultural terminals, farmers in this front-line region are scrambling to survive a harvest under Russian fire. They see Russia’s shelling of the Nika-Tera port facility in the southern city of Mykolaiv on June 4 as just the most dramatic example of a wider assault on a pillar of Ukraine’s economy – and the world’s. “Agriculture is one of the few business sectors that is working… Of course they want to destroy it. They want to end this stream…