The distribution characteristics of Jerusalem artichoke tuber and root

The tuber biomass, tuber number and root biomass which distributed in different root regions of Helianthus tuberosus were tested to explore the distribution of roots and tubers in extreme sparse field conditions. The results showed that the tuber density, root density and number of tubers per unit area decreased with the increasing distance to root centre. The maximum value of all these three indices appeared in the region which the distance to root centre was less than 10 cm. The relationship between tuber density, root density or number of tubers per unit area and the distance to root centre all performed as power function models. The functions were y=160.5x-1.24(R2=0.995), y=817.8x-1.71(R2=0.813)和y=542.7x-0.81(R2=0.917), respectively. However, the tuber biomass production increased firstly and then decreased with the increasing distance to root centre. The maximum value appeared in the region which the distance to root centre was 40-50 cm. Hopefully, the present study can provide more reference information for H.tuberosus cultivation management.