| 叶绿素仪(SPAD)在茶树氮素营养诊断中的适用性研究 |
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| 引用本文： | YANG Yi-yang,马立锋,石元值,RUAN Jian-yun,黎星辉.叶绿素仪(SPAD)在茶树氮素营养诊断中的适用性研究[J].茶叶科学,2008,28(4). |
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| 作者姓名： | YANG Yi-yang 马立锋 石元值 RUAN Jian-yun 黎星辉 |
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| 作者单位： | 1. 农业部茶叶化学工程重点实验室,中国农业科学院茶叶研究所,浙江,杭州,310008
2. 南京农业大学茶叶研究所,江苏,南京,210095 |
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| 基金项目： | 引进国际先进农业科技计划(948计划)，浙江省科技计划，国家科技支撑计划 |
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| 摘 要： | 测定叶片氮素含量是诊断茶树氮素状况的一项重要方法。本文利用盆栽试验,通过不同的供氮水平,研究了利用叶绿素仪(SPAD-502)进行茶树氮素营养快速诊断的适用性。结果表明,茶树新梢产量与氮素用量、成熟叶氮素含量之间呈线性加平台的反应关系,成熟叶的SPAD值与其全氮含量呈显著线性正相关,并与茶树产量存在着比较明显的关系拐点,初步显示SPAD可以较好地表征茶树的氮素营养状况,有可能作为快速诊断方法用于指导茶树施肥,但是还需要通过大田试验进行进一步验证。本文还探讨了测定位点、叶位、天气状况、田间原位或离体测定方式、表面清洗以及样本量等因素对SPAD测试精度的影响。
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| 关 键 词： | 茶树 叶绿素仪 氮素营养 影响因素 |
Evaluation of Nitrogen Status in Tea Plants by SPAD |
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| YANG Yi-yang,MA Li-feng,SHI Yuan-zhi,RUAN Jian-yun,LI Xing-hui.Evaluation of Nitrogen Status in Tea Plants by SPAD[J].Journal of Tea Science,2008,28(4). |
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| Authors: | YANG Yi-yang MA Li-feng SHI Yuan-zhi RUAN Jian-yun LI Xing-hui |
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| Abstract: | Determination of nitrogen concentrations in tissues is an important diagnostic means for N status of plants. A pot experiment with tea plants applied with different amounts of N fertilizer was carried out to evaluate the usefulness of SPAD-502 as a diagnostic tool. The results showed that the yield of young shoots and N concentration of mature leaves responded to N application rates with a pattern of an initial linear increase before a platform was reached. There was a significantly positive linear relationship between the SPAD reading and total N concentration of mature leaves. The similar pattern of an initial linear increase followed by a platform was observed for the relationship between SPAD reading and the yield. These results suggested that the N status of tea plants may be characterized by the measurement of SPAD reading of mature leaves and the SPAD is a potentially useful rapid diagnostic tool in N fertilization recommendation. However, this needs further validation from field experiments. Those factors which may influence the precision of SPAD measurement, such as the point of test on a leaf, selection of leaves from twig (position), weather condition, in situ or in vitro analysis, surface cleaning and the number of leaves for a composite sample were also investigated. |
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| Keywords: | Camellia sinensis L chlorophyll meter nitrogen nutrition affecting factors SPAD |
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