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Feasibility Study of Using Absolute SPAD Values for Standardized Evaluation of Corn Nitrogen Status

机译：使用绝对SPAD值的可行性研究玉米氮地位标准化评估

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Nitrogen fertilizer recommendations for corn (Zea mays L.) should ensure high yields using adequate N doses. Soil–plant analysis development (SPAD) meter technology using absolute SPAD values, might be more reliable than relative SPAD values in helping corn producers making timely decisions about N applications. This study aimed to develop a relationship between absolute SPAD values and leaf N concentration, and to determine optimal leaf N concentrations at early corn growth stages (V6, V8, V10, and V12). Three experiments were conducted during two summer seasons (2014 and 2015) using six N treatments applied at early corn growth stages. In parallel, two experiments were carried out in a high residual N environment to establish the optimum corn leaf N concentration. Results showed a significant linear relationship between corn leaf N concentrations and absolute SPAD values (R2 = 0.80, p 0.05). The mean optimum corn leaf N concentration decreased over corn growth stages. It is of great importance to make the absolute SPAD method accessible for farmers, but more research is required to perform standardized reading of absolute SPAD values data.
机译：玉米氮肥推荐玉米（Zea mays L.）应使用足够的N剂量来确保高产率。使用绝对SPAD值的土壤 - 植物分析开发（SPAD）仪表技术可能比帮助玉米生产商在关于N应用程序的及时决策中的相对SPAD值更可靠。该研究旨在在初期玉米生长阶段（V6，V8，V10和V12）产生绝对SPAD值和叶N浓度之间的关系。在早期玉米生长阶段使用六个N夏季（2014和2015）进行了三次实验。并行地，在高残留的N环境中进行两个实验，以建立最佳玉米叶N浓度。结果显示玉米叶N浓度与绝对SPAD值之间的显着线性关系（R2 = 0.80，P <0.05）。平均最佳玉米叶N浓度降低玉米生长阶段。使农民可访问绝对的SPAD方法是非常重要的，但需要更多的研究来执行绝对SPAD值数据的标准化读数。

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