关键词: 菊芋, 根系, 断根半径, 断根时间

Abstract:

Under the condition of extremely sparse planting in the field, we studied the effects of different root pruning radius and pruning time of Jerusalem artichoke's root biomass and morphological characteristics. The effects of different root pruningon the biomass material distribution of Jerusalem artichoke were revealed, which provided theoretical reference for high-yield cultivation of Jerusalem artichoke in Horqin sandy land. The results show that:compared with no pruning roots, different root pruning radius and time significantly increased the biomass of the root system. Compared with different root pruning radius,when 1/5 roots were removed, the rootbiomass was higher than other treatments, and T3 was the highest, reaching 723.57 g. The effect of different root pruning radius and time had little effect on the biomass of rhizome and fibrous root, and the biomass of main roots was not significant affected. The length and diameter of the main root were not significantly affected by the radius and time of each treatment, from different root pruning time; removing 1/3 root system significantly promoted the thickening growth of fibrous roots and rhizomes. The maximum appeared in T3, the fibrous root was 5.59 mm and rhizome was 3.88 mm. Removing 1/4 of the root system could increase the number of fibrous roots and rhizomes. It was found that fibrous roots and rhizomes biomass were greatly increased by changing the substance distribution rule of Jerusalem artichoke. In the late vegetative growth, moderate and mild root pruning was beneficial to increase the root biomass, increase the number of fibrous roots and rhizomes, and enhance root absorption ability, and then increase the yield of Jerusalem artichoke.

Key words: Jerusalem artichoke, Root system, Pruning radius, Pruning time