The difference of nitrogen uptake and utilization in waxy corn III.Genetic differences in nitrogen distribution and translocation 14CO2 Fixation and Translocation of Photoassimilates as Selection Criteria of Egyptian Taro Genotypes Effects of controlled-release nitrogen fertilizer on carbon and nitrogen metabolism of summer maize Effects of Nitrogen Fertilizer on Nitrogen Accumulation, Translocation and Nitrogen Use Efficiency in Rapeseed (Brassica napus L.)