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Acta Agron Sin ›› 2015, Vol. 41 ›› Issue (02): 318-328.doi: 10.3724/SP.J.1006.2015.00318

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

Morphological Structure Model of Leaf Space Based on Biomass at Pre-Overwintering Stage in Rapeseed (Brassica napus L.) Plant

ZHANG Wei-Xin1,2,CAO Hong-Xin2,*,ZHU Yan1,*,LIU Yan2,ZHANG Wen-Yu2,CHEN Yu-Li2,FU Kun-Ya1,2   

  1. 1 College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China; 2 Institute of Agricultural Economy and Information / Engineering Research Center for Digital Agriculture, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
  • Received:2014-06-16 Revised:2014-09-30 Online:2015-02-12 Published:2014-11-11
  • Contact: 曹宏鑫, E-mail: caohongxin@hotmail.com; 朱艳, E-mail: yanzhu@njau.edu.cn E-mail:nkyzwx@126.com

Abstract:

Rapeseed morphogenesis at pre-overwintering stage is the basis of growth and development of rapeseed in whole growth stage, and the leaf blades are important vegetative organ in this stage. To quantify the relationships between rapeseed plant architecture indices and the corresponding organ biomass, we used three cultivars including (V1) Ningyou 18 (conventional variety), (V2) Ningyou 16 (conventional variety), and (V3) Ningza 19 (hybrid) in the field experiments, and designed treatment of variety-fertilizer, variety-fertilizer-density, and variety tests in 2011–2012 and 2012–2013, with three fertilizer levels of no fertilizer, normal fertilizer (N, P2O5, K2O are 90 kg ha–1), and high fertilizer (N, P2O5, K2O are 180 kg ha–1), and three density levels of D1 (6×104 plant ha–1), D2 (1.2×105 plant ha–1), and D3 (1.8×105 plant ha–1). Morphological indices were determined at pre-overwintering stage, the biomass-based rapeseed aboveground structure model was established with morphological indices, and the relationships between leaf blade indices and leaf blade biomass were analyzed. The models were verified using independent experiment data in 2011–2012, and 2012–2013, showing that the simulated values from the rapeseed plant leaf space morphological structure models, such as leaf blade length, leaf blade width, leaf blade bowstring length, leaf blade petiole length, and leaf blade angle from 2011 to 2012 were goodness of fit to observed values, and their da values and RMSE values were –0.231 cm, 2.102 cm (n=63); –0.273 cm, 0.484 cm (n=63); –0.343 cm, 1.963 cm (n=63); 0.412 cm, 2.095 cm (n=36); –0.635 cm, 1.006 cm (n=27); 4.421°, 14.734° (n=63); 6.642°, 21.817° (n=63), respectively. The correlation between observation and simulation in the morphological indices were significant at P<0.001, but the dap values were less than 5% for the leaf blade length and the leaf blade bowstring length, which indicated that these models’ accuracy is high. The simulated values of the models had better consistency and better reliability with the observed values at pre-overwintering stage except for petiole length of the short-petiole leaves, leaf tangent angle, leaf bowstring angle, and the CPLB (partitioning coefficient of blade dry weight) under the condition of no fertilizer.

Key words: Rapeseed (Brassica napus L.), Leaf blade, Biomass, Morphological structure, Model

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