Effect of ammoniumitrate ratio in nutrient solution on control of Fusarium wilt of tomato by Trichoderma asperellum T34

摘要

The behaviour of Fusarium oxysporwn f.sp. lycopersici (Fol) and the effectiveness of the microbial control agent Trichoderma asperellum strain T34 were examined in hydroponically grown tomato plants under five ammoniumitrate ratios. The results showed that disease severity was reduced by the action of T34 under increasing concentrations of ammonia. Furthermore, rhizosphere F. oxysporum populations decreased with T34 application. The presence of T34 augmented leaf nitrogen concentration in treatments infested with Fol. In addition, T34 application reduced iron concentration in tomato leaves at high ammoniumitrate ratios and reduced the severity of Fusarium wilt at high iron and nitrogen leaf concentrations.