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采用田间与盆栽试验以及测试分析相结合的方法，在不施肥（ＣＫ）和施肥（ＮＰＫ）条件下，研究了耐低ＮＰＫ养分的高效、中效和低效基因型小麦的硝还原酶活性、叶绿素含量和光合速率的基因型差异。结果表明，耐低ＮＰＫ养分的高效基因型，在不施肥条件下具有较高的硝酸还原酶活性、叶绿素含量和光合速率，相对硝酸还原酶活性、相对叶绿素含量和相对光合速率也较高。相关分析表明，小麦相对产量与相对硝酸还原酶活性、相对叶绿素含量、相对ＣＯ２同化速率间呈极显著正相关，表明耐低ＮＰＫ养分的高效基因型之所以相对产量较高，是因为体内相对吸收同化ＮＯ－３和同化ＣＯ２的能力较强所致；低效基因型正相反；中效基因型介于二者之间。
Nitrogen reductase activity of wheat cultivars with high, medium, and low efficiency NPK, which tolerate low NPK, were studied under the condition of no fertilization (CK) and fertilization (NPK) by field and pot experiment and the combination of test and analysis. Genotypic differences in chlorophyll content and photosynthetic rate. The results showed that high efficient NPK tolerant genotypes had higher nitrate reductase activity, chlorophyll content and photosynthetic rate, relative nitrate reductase activity, relative chlorophyll content and relative photosynthetic rate. Correlation analysis showed that there was a significant positive correlation between relative yield of wheat and relative nitrate reductase activity, relative chlorophyll content and relative CO2 assimilation rate, indicating that the relative yield of high-yielding genotypes with low NPK tolerance is relatively high because of the relative absorption in vivo Assimilation of NO-3 and assimilation of CO2 due to a strong ability; inefficient genotypes in the opposite; median genotype in between the two.