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Acta Agron Sin ›› 2008, Vol. 34 ›› Issue (12): 2176-2183.doi: 10.3724/SP.J.1006.2008.02176

• TILLAGE & CULTIVATION · PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effect of Panicle Fertilizer Application Rate on Morphological, Ecological Characteristics, and Organ Temperature of Rice

YAN Chuan,DING Yan-Feng,WANG Qiang-Sheng,LI Gang-Hua,LIU Zheng-Hui,MIAO Xiao-Jian,ZHENG Yong-Mei,WEI Guang-Bin,WANG Shao-Hua*   

  1. Key Laboratory of Crop Growth Regulation, Ministry of Agriculture / High-Tech Key Laboratory of Information Agriculture of Jiangsu Province, Nanjing Agricultural University, Nanjing 210095, Jiangsu, China
  • Received:2008-03-06 Revised:2008-05-03 Online:2008-12-12 Published:2008-10-10
  • Contact: WANG Shao-Hua E-mail:wangsh@njau.edu.cn

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Abstract:

Using 2 japonica and indica rice cultivars with three panicle fertilizer application rate treatments and a control, different populations of rice were constructed, and the effect of panicle fertilizer application rate (PFAR) on morphological, ecological characteristics and organ temperature of rice were studied. The results showed that PFAR had a significant effect on length of panicle, panicle camber, length of leaf and leaf angle. It was also observed that air temperature, humidity, light intensity and content of CO2 were also affected by different PFAR treatments, medium PFAR was proved to be best for microclimate within rice population. Besides, there were felicitous leaf area index, length of second leaf, photosynthetic rate, transpiration and lower canopy temperature at medium PFAR. The temperature of plant organs was significantly affected by PFAR, the more the PFAR, the lower the temperature of panicle and leaf. The organ temperature was significantly different at the 0.05 level between medium PFAR and lower PFAR, control treatments, while not significantly between medium PFAR and higher PFAR. This study clearly showed that appropriate agronomic practices, such as PFAR, have a significant effect on the temperature of plant organs and canopy, and also enhance the resistance to heat stress.

Key words: Rice, Panicle fertilizer, Morphological, Microclimate, Temperature of panicle and leaf

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