Study on the effect of continuus cropping on the growth of eggplant seedlings

The effects of continuous cropping on the growth of eggplant and its mechanism were studied with pot experiment. The results show that during the growth period of 45 days, under the condition of continuous cropping, the planbt height, leaf area, main and total root lengths of the eggplants are obviously lower that those under the condition of mono-cropping causing the shoot and root fresh weight of eggplants to decreas by 33.2% and 30.2%, respectively, and the endangerment of Meloidogyne becomes more sever with the growth of eggplant seedlings. Although Meloidogyne are eliminated by autoclaving continuous mono-cropping soil, eggplant seedlings growth can not be improved compared to mono-cropping ones growing in sterilizing soil, and the germination of eggplant seeds under continuus mono-cropping is lower by 15% than that under mono-cropping in 7 days after planting, which suggests that the obstacles of continuous cropping maybe result from Meloidogyne and allelopathy. It si further verified that the more the adding root extudates is, the more their inhibition on the growth of eggplant radicles and plumules is, idicating that allelopathy is one of the important genes in th eobstacles of eggplant continuous cropping.