In North America OPD has increased by about 18 ×104 plants ha-1 with 35 Mg ha-1 increased in yield按照nature food期刊标准润色以上段落。
In North America, the overall plant density (OPD) has increased by approximately 1.8 × 104 plants per hectare, resulting in a yield increase of 3.5 megagrams per hectare.
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