There is an urgent need among plant breeders for a deeper understanding of the links between wheat genotypes and their ability to utilize light for biomass production and their efficiency at converting the biomass into grain yield. This field trail was conducted to investigate the variations in radiation use efficiency (RUE) and harvest index (HI) of four spring wheat cultivars grown on two soil types with two nitrogen (N) fertilization levels. Grain yield (GY) was significantly higher with 200 kg N ha⁻¹ than 100 kg N ha⁻¹ and on clay soil than on sandy soil, and a similar trend was observed for shoot dry matter (DM) at maturity. RUE and HI was neither affected by cultivar nor N-fertilization, but was affected by soil type, with a significantly higher RUE and HI on clay than on sandy soil. The differences of water holding capacity between the two soil types was suggested to be a major factor influencing RUE and HI as exemplified by the principal component analysis. Thus, to achieve a high RUE and/or HI, sustaining a good soil water status during the critical growth stages of wheat crops is essential, especially on sandy soils with a low water holding capacity.

中文翻译：

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品种，氮素供应和土壤类型对春小麦辐射利用效率和收获指数的影响

植物育种者迫切需要对小麦基因型之间的联系及其利用光进行生物质生产的能力及其将生物质转化为谷物的效率的深入了解。进行了该田间试验，以研究在两种土壤类型上以两种氮（N）施肥水平生长的四个春小麦品种的辐射利用效率（RUE）和收获指数（HI）的变化。200 kg N ha ^-1时的谷物产量（GY）明显高于100 kg N ha ^-1并且在黏土上比在沙土上，成熟期的茎干物质（DM）观察到相似的趋势。RUE和HI不受品种和氮肥的影响，但受土壤类型的影响，粘土上的RUE和HI显着高于沙质土壤。主成分分析表明，两种土壤类型的持水能力差异是影响RUE和HI的主要因素。因此，为了获得较高的RUE和/或HI，在小麦作物的关键生长阶段保持良好的土壤水分状况至关重要，尤其是在持水能力低的沙质土壤上。