Welcome to Journal of Tea Science,Today is

Journal of Tea Science ›› 2008, Vol. 28 ›› Issue (4): 301-308.doi: 10.13305/j.cnki.jts.2008.04.007

Previous Articles     Next Articles

Evaluation of Nitrogen Status in Tea Plants by SPAD

YANG Yi-yang1,2, MA Li-feng2, SHI Yuan-zhi2, RUAN Jian-yun2,*, LI Xing-hui1,*   

  1. 1. Tea Research Institute, Nanjing Agriculture University, Nanjing 210095, China;
    2. Key Laboratory of Tea Chemical Engineering, the Ministry of Agriculture and Tea Research Institute of Chinese Academy of Agriculture Sciences, Hangzhou 310008, China
  • Received:2007-10-08 Online:2008-08-15 Published:2019-09-12

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.

Key words: Camellia sinensis L., chlorophyll meter, nitrogen nutrition, affecting factors, SPAD

CLC Number: