| In order to clarify high-yielding and high-efficiency density and nitrogen-fertilizer transportation pattern for high quality wheat, the research studied the effects of nitrogen-density intercropping on population size, light utilization and grain yield composition of strong gluten wheat. Using strong gluten wheat "Shi Luan 02-1", the experiment adopted a split-zone design, with planting density of 180(D180), 240(D240), 300(D300), 360(D360), 420(D420) million plants/hm2 for the main zone, and the nitrogen topdressing mode for the secondary zone, including single application at jointing stage (N1) and split application at jointing + flowering (N2). With the increase of planting density, vegetation index and total stem number at jointing stage gradually raised, while the photosynthetically effective radiation transmittance of different levels of canopy decreased continuously at 21th day after anthesis. Increasing or decreasing planting density on the basis of 3~3.6 million plants/hm2 density had no significant effect on stem number at anthesis, vegetation index at 28th days after anthesis, net photosynthetic rate of flag leaves at mid to late grain filling stage and grain yield. Compared to N2, N1 was more favorable to enhance vegetation index at jointing stage, total stem number at flowing stage, net photosynthetic rate of flag leaves at 21-28th days after anthesis, as well as spike number and grain yield. Planting density was the most important cultivation factor regulating population structure, light utilization and grain yield of strong wheat Shiluan 02-1 compared with the nitrogen topdressing pattern and nitrogen-density intercropping. The combination of reasonable planting density and N topdressing alone was the potential to synergistically improve the grain yield and light utilization of strong gluten wheat. Under the conditions of this experiment, planting density of 3-3.6 million plants/hm2 combined with nitrogen supplementation at jointing was the optimal model for achieving higher yield and efficiency in Shiluan 02-1. |
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