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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (08): 1529-1537.doi: 10.3724/SP.J.1006.2012.01529

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Characteristics of Plant Morphological Parameters and Its Correlation Analysis in Maize under Planting with Gradually Increased Density

TANG Li-Yuan1,2,LI Cong-Feng2,MA Wei2,ZHAO Ming2,*,LI Xiang-Ling2,LI Lian-Lu1   

  1. 1 College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; 2 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2012-01-18 Revised:2012-04-20 Online:2012-08-12 Published:2012-06-04
  • Contact: 赵明, E-mail: zhaomingcau@163.net, Tel: 010-82108752

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Abstract: The object of this study was to analyze the dynamic characteristics of plant stalks morphological parameters and its effect using four maize cultivars (Zhengdan 958, Xianyu 335, Denghai 661, Yinong 103) with 13 treatments of gradually increased density from 1.67 to 16.67 plants m-2 under planting with gradually increased density in field experiments. Final yield and physical plant height, stem diameter at jointing stage, huge bellbottom stage and physiological maturity stage were measured. The results showed that with density increase progressively, the plant height rose at jointing stage and then declined after huge bellbottom stage, the ear height and height ratio of ear to plant climbed up. Lodging easily occurred when height ratio of ear to plant was greater than 0.4. Therefore lodging rate could be decreased if the ear height lowered. Internodes had the trends of elongation below the ear and contraction above the ear, and shortened from top to bottom in the whole stem. The ratio of broadside to narrowside of stem diameter had no significant changes. Plant height, ear height and stem diameter all reflected to densities harmonically. Stem elongation was main displayed by internodes below the ear, ear height and height ratio of ear to plant had very significant negative correlation with stem in different stages, and the correlation coefficient of above –0.7701**.

Key words: Increase density gradually, Maize, Plant, Morphological parameter.

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