Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2019, Vol. 40 ›› Issue (5): 831-838.DOI: 10.3969/j.issn.1000-2561.2019.05.001

• Crop Culture and Nutrition, Genetic Breeding •     Next Articles

Nitrogen Nutrition Characteristics of Rubber Tree Leaves and Its Response to Nitrogen Application Rate

CHEN Yanbin1,2, ZHANG Yongfa2,3, WANG Wenbin2,3,*(), XUE Xinxin2,3, LUO Xuehua2,3, WU Xiaoping2,3, WANG Dapeng2,3, ZHAO Chunmei2,3   

  1. 1. College of Tropical Crops, Hainan University, Haikou, Hainan 570228, China
    2. Rubber Research Institute, Chinese Academy of Tropical Agriculture Sciences, Haikou, Hainan 571101, China
    3. Soil and Fertilizer Research Center, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
  • Received:2018-09-25 Revised:2019-01-23 Online:2019-05-25 Published:2019-05-31
  • Contact: WANG Wenbin
  • About author: WANG Wenbin,E-mail:mywwb@163.com.


Rubber tree saplings planted after 2 years were used as the planting material, and a single-factor randomized block design field experiment was conducted to set three treatments with different nitrogen levels (low nitrogen 28 g/plant, medium nitrogen 56 g/plant and high nitrogen 84 g/plant). The parameters of rainfall, daily average temperature, nitrogen content of mature leaves, chlorophyll content and other indicators were dynamically observed for regression analysis and correlation analysis. The nitrogen content of rubber tree leaves showed a decline trend during the annual growth cycle. The difference of nitrogen contents in the leaves between different treatments was not significant. The dynamic change of chlorophyll content in the leaves had obvious seasonal variations, and several peaks were observed throughout the growth cycle. There was no significant chlorophyll content difference between different nitrogen levels. The results of correlation analysis showed that chlorophyll content and total nitrogen content were positively correlated (P<0.05). The nitrogen contents in the leaves was positively correlated with rainfall and temperature, and its correlation with temperature was extremely significant (P<0.01) while its correlation with rainfall was significant (P<0.05). Chlorophyll a, chlorophyll b and chlorophyll content were all extremely correlated with rainfall and temperature (P<0.01). Chlorophyll a/b ratio was extremely negatively correlated with N application rate, and a decrease in chlorophyll a/b ratio was observed with an increase in N rate. Obvious increment of N content in rubber leaves were found after N fertilizer application. Chlorophyll content could be regarded as an indicator revealing N status of rubber leaves to some degree. However, season and climate factors should be considered together.

Key words: nitrogen application rate, rubber tree, nitrogen nutrition, variation

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