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Acta Agron Sin ›› 2011, Vol. 37 ›› Issue (02): 321-330.doi: 10.3724/SP.J.1006.2011.00321

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

Dynamic Characteristics of Leaf Area Index in Maize and Its Model Establishment Based on Accumulated Temperature

LI Xiang-Ling1,2,ZHAO Ming1,*,LI Cong-Feng1,GE Jun-Zhu1,HOU Hai-Peng1   

  1. 1 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences / Key Laboratory of Crop Ecophysiology and Cultivation, Ministry of Agriculture, Beijing 100081, China; 2 College of Agronomy, Shenyang Agricultural University, Shenyang 110161, China
  • Received:2010-07-05 Revised:2010-09-28 Online:2011-02-12 Published:2010-12-15
  • Contact: 赵明, E-mail: zhaomingcau@163.net, Tel: 010-82108752

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Abstract: In order to clarify the demand of accumulated temperature in the growth process of maize cultivars of different maturities and the relationship between leaf area index and accumulated temperature. Three cultivars used (Yinong 103, Xianyu 335, and Denghai 661) were carried, with three sowing dates (May 3rd, May 28th, and June 22nd) and four density treatments (45 000 plants ha-1, 60 000 plants ha-1, 75 000 plants ha-1, and 90 000 plants ha-1). The dynamic characteristics of leaf area index were measured and the model based on accumulated temperature were established. The largest LAI and accumulated temperature from emergence to maturity were normalized, and the six main models were compared. Results show that, the Ration equation y=(a+bx)/(1+cx+dx2) had a good simulation results and would be used significantly in biological applications, the equation was y=(-0.05247+1.2766x)/ (1-2.6346x+3.6359x2), r = 0.9479**, where is relative seedling groups LAI, (a+ b)/(1+c+d) is the relative maturity groups LAI.The values of a and c had a slightly difference, however, the values of b and d changed dramatically among sowing dates and among varieties, and a small difference among densities, showing that sowing dates changed the LAI mainly through the values of b and d in maize. The accuracy and precision of the normalized model were tested with the data of 2008 and the data of 2007 in Huadian, Jilin, the simulation accuracy (k) was all above 0.9392**, and the precision (R2) was all above 0.9996**.  Sowing dates regulated the growth days, average temperature, accumulated temperature, average LAI, change rate of LAI and grain yield in different maturity cultivars of maize, when the sowing date delayed, the growth days, accumulated temperature, the average LAI and grain yield were all decreased, the average temperature was increased.The growing days and accumulated temperature showed as Denghai 661> Xianyu335> Yinong 103, grain yield and average LAI showed as Xianyu335 > Denghai 661 > Yinong 103.

Key words: Maize, Leaf area index, Active accumulated temperature, Simulation model, Sowing date

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