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耐盐牧草有选择性吸收Ｋ＋的能力，通过比较在相同盐份中生长的不同牧草种的叶片Ｋ＋／Ｎａ＋，可鉴定出种间耐盐性，Ｋ＋／Ｎａ＋值大的材料耐盐性强。
Salt tolerant forages have the ability to selectively absorb K +, and salt tolerance can be identified by comparing leaf K + / Na + of different forages grown in the same salt, with high K + / Na + values for salt tolerance.