Effects of crop straws on root knot nematodes and soil fungi in continuous cropping of tomato

Pot experiments were done with 3-types of straws (wheat straw, onion leaves straw and Jerusalem artichoke straw) as soil additives to determine their effects on plant nematodes. The straw application not only reduced the number of root knots in tomato, but also it also reduced the fungal species diversity. The fungal species diversity in the soil treated with onion leaves straw and Jerusalem artichoke straw differed significantly at 50 and 70 d. Furthermore, the classification analysis of the 23 fungal genera showed that four genera had an extremely positive correlation with the number of root knot nematodes and two genera had a significant positive correlation with the number of root knot nematodes.