Determination of hydrolysable nitrogen content containing soils with automatic determination of nitrogen analyzer;

2R-hydroxy-3-phenylpropanoic acid benzyl ester as fragment one wassynthesized from D-Phe through diazotization hydrolysis and esterification by benzylalcohol in a yield of 56%;(tert-Butoxycarbonyl-methyl-amino)-acetic acid asfragment two was obtained in a yield of 83% from glycine through Bocamino-protection and N-methylation;2-tert-Butoxycarbonylamino-3-methyl-pentanoic acid as fragment three.

Effects of irrigation and fertilization treatments on transfer and utilization of water and nitrogen in maize root zone;