Abstract: With a medium gluten wheat variety Jimai 22 as the test material, a field experiment was carried out at Mengcheng of Anhui Province to study the effects of nitrogen application and density on the all stems and yield of late-sown wheat. The amount of all stems of the tested variety under different densities were all increased after emer- gence, reached the highest at jointing stage, and decreased afterwards, showing single peak curves for all densities, and the treatment of D₅₂₅ has the largest stems at all growth stages expect seedling. The D₄₅₀ has the highest grain yield, being 8 823. 3 kg/ha, while no significant difference compared with other densities. With the increase of planting density, grain number per spike decreased, spike number increased, but no obvious change on 1000-grain weight. The number of all stems changed in different nitrogen applications was the same as densities; appropriate de- laying nitrogen topdressing time contributes to the stability of late-sown wheat stems. The differences among different nitrogen applications of late-sown wheat spike number, biological yield, economic coefficient were not significant, but the grain yield of 4:6 (Booting stage) treatment was the highest, being 8 618. 0 kg/ha, which showed no significant difference with others but the exception of 10:0 (Basal) treatment.

Key words: Late-sown wheat, Nitrogen application, Density, The number of all stems, Grain yields

CLC Number: 

• S143.1