Optimizing plant spatial competition can change phytohormone content and promote tillering, thereby improving wheat yield.

Further analysis of the correlation between tiller growth characteristics and various hormones at different sowing dates showed that when the sowing date was postponed, the correlation between TP and TA, TW and IAA, and ZR and S/G showed an increasing trend.

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However, under the interaction of factors, such as Y × SD × RS, as the source of variation for different tillering characteristics, only ETS and PETS showed highly significant differences, whereas the other indicators showed no significant differences.

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