The averaged OPDs was109 ×104 plants ha−1 and 94 ×104 plants ha−1 for Liu et al 2021 and Luo et al 2020 respectively Both of them overestimated the national OPDs due to the limited environment inputs

The average estimated optimal planting densities (OPDs) were 10.9 × 104 plants ha−1 and 9.4 × 104 plants ha−1, as reported by Liu et al. (2021) and Luo et al. (2020), respectively. However, it should be noted that both studies may have overestimated the national OPDs due to the limited availability of environmental input data. Despite this limitation, it is worth acknowledging that both studies utilized robust data and established reliable statistical models.