Effects of Nitrogen Application Rate on Yield and Agronomic Trait in High-yield Wheat Cultivar Yunmai 53

In order to provide a theoretical basis for properly nitrogen application of high-yield wheat cultivar Yunmai 53. Field experiments were carried out during 2011-2012 in Yimen, Mile and Longyang. The experiments were all designed as randomized block arrangement with the application rates of N 0, 75, 150, 225, 300 kg/hm2, respectively, indicated as N0, N75, N150, N225 and N300, respectively. The results showed that the grain yield all increased with the increasing of nitrogen application amount in Longyang, although the difference in grain yield was statistically insignificant between N225 and N300, but those of N150 reached the highest in Yimen and Mile, then decreased, it statistically decreased at N300. The spikes number per hectare and grains number per spike increased with the increasing of nitrogen application amount, it showed the highest spike number and grains number per spike when nitrogen application amount was 225 kg per hectare in Yimen and Mile. But thousand kernel weight of N0 was the highest in Mile, which of N75 was the highest in Yimen and Longyang, it decreased with the increasing of nitrogen application amount. Plant height and ear length increased with the increasing of nitrogen application supply. On the whole, the proper N application with 150~225 kg/hm2 was beneficial to increasing spike number and grains number per spike, resulting in achieving satisfactory grain yield of Yunmai 53.