Data collection
Density and plant height were observed during the ES (April 15), LS (May 15), EG (June 15), LG (July 15), FR (August 15), and MR (September 20) periods in 2018, and seed yield per m2 was observed in MR (September 20) in 2018. The statistical analysis of density, plant height, and seed yield were the same as in Experiment 3.