Abstract
Wheat (Triticum aestivum L.) is a staple crop worldwide, and yield improvement since the green revolution was attributed to chemical nitrogen (N) fertilizer application. We conducted field experiments in Yuncheng County, Shanxi Province, under planting density (2 million plants haâ1, 2.25 million plants haâ1, 2.5 million plants haâ1) and topdressing nitrogen (12 kg haâ1, 22 kg haâ1, 32 kg haâ1). The results shown that the starch content of grains with a density of 2.5 million plants haâ1 increased by 1.9%-7.5%, which improved the water absorption of flour and the processing quality of flour, but decreased the protein content, and gluten properties of grains. The nitrogen topdressing amount of 22 kg haâ1 wheat tiller increased by 6.3%-33.3%, and the dry matter accumulation increased by 1.0%-9.5%. The number of spikes increased by 3.7%-19.2%, and the yield increased by 3.7%-17.8% with the nitrogen topping amount of 22 kg haâ1 the protein content increased by 2.0%-4.2% with the nitrogen topping amount of 22 kg haâ1, the starch content increased by 1.2%-7.2%, and the gluten index increased by 4.3%-21.5%.
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