| In order to provide a theoretical basis for stable and high-yield cultivation of wheat in lime concretion black soil region of Huaibei plain and select a reasonable nitrogen-density configuration for local wheat planting, under the field conditions, we used winter wheat varieties Annong 0711(AN0711) and Yannong 19(YN19) as experimental materials and used the split zone design.The planting densities of 150×104/, 210×104/, 270×104/ and 330×104/ plants·hm-2 were represented by D1, D2, D3 and D4, respectively, and nitrogen application rates were 135,180,225 and 270 kg·hm-2, represented by N1, N2, N3 and N4, respectively.The effects of nitrogen-density interaction on canopy structure, photosynthetic characteristics and grain yield of winter wheat were analyzed.The results showed that nitrogen-density interaction improved wheat canopy structure and had a significant effect on canopy photosynthetic characteristics.Plant height and ear length were increased with the increase of planting density and nitrogen application rate.The Pn and SPAD values of flag leaves were decreased with increased planting density, but increased significantly with increased nitrogen application rate.There was no significant difference between treatments when nitrogen application over 225 kg·hm-2.From a population perspective, the increase in planting density and nitrogen application significantly increased LAI and IPAR.At booting stage and flowering stage, LAI and IPAR of D4N4 were the largest, while in the middle stage of filling, D3N3 had the largest LAI and IPAR.Nitrogen fertilizer and density had significant interaction effects on grain yield.Both varieties had the highest yield under D3N3, and the highest yields were 7 866.67 kg·hm-2 and 7 400.00 kg·hm-2, respectively.Nitrogen-density interaction on the photosynthetic characteristics and grain yield of winter wheat canopy showed that D3N3 treatment significantly enhanced the photosynthetic characteristics of winter wheat canopy and increased yield.Under the experimental conditions, the suitable planting density and nitrogen application rate were 270×104/ plants·hm-2 and 225 kg·hm-2. |
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