摘要: … As yields have slowly crept upwards, so has fertilizer nitrogen use. By contrast, in sugar beet… flux of combined nitrogen through water, soil and air, the increase is unevenly spread, being …
Improving sustainability in organic and low input food production systems. Proceedings of the 3rd International Congress of the European Integrated Project Quality Low Input Food (QLIF), University of Hohenheim, Germany, 20-23 March, 2007.,2007, 引用: 7