Effect of Different Nitrogen Application Types on N-Absorption and N-Utilization Rate of Specific Use Cultivars of Wheat

The study was carried out in 2000—2002. Two specific use cultivars of wheat, Jinan 17 and Shaannong 229 were used for the effect of different nitrogen application methods on N-absorption and N-utilization rate. The results indicated that N-absorption intensity, N-translocation efficiency and contribution rate of N transferring to grain in strong gluten wheat Jinan 17 were higher than that in middle gluten wheat Shaannong 229 at the middle and late developing stages, its yield of protein and N-utilization rate and N-absorption efficiency of the same treatments were also higher. In this test, 262.5—328.1 kg/ha of total N application with the proportion of 5∶2.5∶2.5, at seedling, jointing and flowering stage respectively was the optimum N application method for Jinan 17, while for Shaannong 229 that was 196.9—262.5 kg/ha of total N with 40%—60% topdressing at jointing stage.