僵藕是近年来藕莲主产区新出现的一种病态表现。发病率不断上升,发生程度日趋严重,已导致部分地区大幅度减产,甚至失收。连作4~6年以上的僵藕田,发病严重;而未种过莲藕的田块,发病很轻。用轻度僵化的藕作种,种植后会加快僵化程度,而用正常藕作种,一般不发生僵化现象。大量施用化肥,特别是碳酸氢铵、尿素等,造成藕田有机质含量逐年下降,理化性质变劣,莲藕僵化程度也逐年加重。1.发病症状地上、地下部分各器官均比正常植株明显小,藕身表皮出 Zuotun is a newly emerged morbid manifestation of lotus root main producing areas in recent years. The incidence has been on the rise and the degree of occurrence has become more and more serious. This has led to the drastic reduction of production and even the loss in some areas. Even for 4 to 6 years of stubborn lotus field, a serious disease; not planted lotus fields, the incidence is very light. Slightly rigid with the lotus for planting, planting will speed up the degree of rigidity, but with normal lotus seed, generally does not occur rigid phenomenon. A large number of chemical fertilizers, especially ammonium bicarbonate, urea, resulting in lotus root organic matter content decreased year by year, physical and chemical properties worse, the degree of rigidity of the lotus root also increased year by year. 1. Symptoms on the ground, the underground part of the organs were significantly smaller than normal plants, lotus body epidermis