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Biomass-based dynamic model for rice root system

LIU Yong-xia1,2,YUE Yan-bin3,LIU Yan1,CAO Hong-xin1,GE Dao-kuo1,WEI Xiu-fang1(1.Institute of Agricultural Resources and Environment,Engineering Research Center for Digital Agriculture,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China;2.Haikou Experimental Station,Chinese Academy of Tropical Agricultural Science,Haikou 571100,China;3.Guizhou Academy of Agricultural Sciences,Guiyang 550006,China)  
To build the dynamic model for rice root system according to the geometry parameters and to achieve visualization of the root system in combination with computer graphics,three rice cultivars,Liangyou108(hybrid long-shaped rice,Va1),86you8(hybrid round-shaped rice,Va2) and Nanjing43(round-shaped rice,Va3),were planted in pots.There are two different levels of fertilizer: fertilizer(N 3.6 g,P2O5 0.8 g,K2O 3.6 g),and no fertilizer(with loamy soil).Based on the experimental observations,the relationships between the root dry weight and root length,root volume,and root surface area were analyzed,respectively.The power function Y=axb was showed to describe above relationships.The RMSEs between the simulation values and the observation values of the root length per plant,the root volume per plant,and the root surface area per plant were 358.138 1 cm,2.089 1 cm3,and 136.325 2 cm2 in 2008 respectively,and 42.993 7 cm,0.314 9 cm3,and 14.072 8 cm2 in 2009 respectively,which revealed that the model established was reliable,accountable and universal.This research would lay a basis for developing function-structure rice models.
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