A New Method for Winter Wheat Critical Nitrogen Curve Determination
文献类型：SCI/SSCI论文
| 作者 | Chen P. F. ; Zhu Y. Q. |
| 发表日期 | 2013 |
| 关键词 | dry-matter accumulation north china plain pure grass stand dilution curve maize-crops sativa l. growth plant corn management |
| 英文摘要 | As a plant-based N diagnostic tool, critical N curves can be used to adjust the N input in a field according to the crop demand. Because the existing critical N curve determination methods may overestimate the critical N point, making the designed N curve above the actual one, this study presents an improved method to overcome this drawback. An N experiment was conducted during 2 yr (2010-2012) using different winter wheat (Triticum aestivum L.) cultivars in the northwestern plain of Shandong Province, China. Shoot biomass and N concentration were sampled weekly during the growing season. A new method for designing critical N curves was developed based on the existing N curve determination method and the t-test inversion. Using the above data set, the new and existing methods for designing a critical N curve were compared, and the effects of the different cultivars on the proposed N curve were evaluated. The results showed that the critical N curves generated using existing methods can successfully classify N-limited plants but fail to classify non-N-limited plants, however, the critical N curve determined using the new method was able to classify both N-limited and non-N-limited plants satisfactorily. Cross-validation showed that the new method exhibited a highest total correct classification rate of 76%, while the existing methods displayed total correct classification rates below 64%. Additionally, the proposed critical N curve is robust within species within the same region. Thus, the new method may be useful for N management in the field. |
| 出处 | Agronomy Journal |
| 卷 | 105 |
| 期 | 6 |
| 页 | 1839-1846 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0002-1962 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/30625]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Chen P. F.,Zhu Y. Q.. A New Method for Winter Wheat Critical Nitrogen Curve Determination. 2013. |
入库方式： OAI收割
来源：地理科学与资源研究所
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