Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (19): 52-57.doi: 10.11924/j.issn.1000-6850.casb2020-0219

Special Issue: 园艺

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The Diagnosis and Evaluation of Nutritional Status of Pear Leaves

Chen Qiliang(), Fan Jing, Yang Xiaoping, Zhang Jingguo, Du Wei, Hu Hongju()   

  1. Institute of Fruit and Tea, Hubei Academy of Agriculture Sciences, Wuhan 430064
  • Received:2020-06-30 Revised:2021-04-17 Online:2021-07-05 Published:2021-07-29
  • Contact: Hu Hongju E-mail:cql99@sina.com.cn;hongjuhu@sina.com

Abstract:

To provide a basis for scientific fertilization, the leaf nutrient status of ‘Chojuro’ pear in Lichuan was studied. The leaf nutrition status of 9 pear orchards was diagnosed and evaluated by leaf nutrition diagnosis and principal component analysis in 2017-2018. The contents of Ca, K, Cu, and Zn in the leaves of ‘Chojuro’ pear tree were basically suitable, while the contents of Mg, B, and P were low, and the content of Mn was high. The content of N in some orchards was deficient, and the content of Fe was low in 2017. Soil acidification was the main cause of nutrient imbalance in the pear leaves. To improve the quality and efficiency of ‘Chojuro’ pear orchards in Lichuan, we should increase the application of acid soil conditioner such as quicklime, borax and other alkaline fertilizers to improve soil pH, and organic fertilizer to raise the organic matter content, pay attention to the supplement of micronutrient Mg, B and Fe. 4 principal components which represented 82.512% of the original information were evaluated by principal component analysis with 10 leaf nutrient elements. According to the scores of each principal component, a comprehensive evaluation model of leaf nutrition based on principal component was established: Z=0.278N+ 0.030P+ 0.250K- 0.042Ca- 0.133Mg+ 0.193Fe+ 0.193Mn+ 0.174Cu+ 0.177Zn- 0.106B. This method could be used to diagnose and evaluate the nutritional status of pear leaves.

Key words: leaf nutrition diagnosis, leaf nutrition evaluation, principal component analysis, nutrient elements, fertilization in pear orchard

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