The nitrogen between minimum protein content and maximum yield were the nitrogen of coordinated variation of yield and grain protein content in 50% or 60% of soil water content.

• 蛋白质含量最低值和产量最高值之间对应的施氮量为产量和蛋白质含量在土壤水分含量为田间最大持水量的50%25和60%25条件下协同变化的施氮量区间。