Chinese cabbage dry heart is a disease that has been strongly reflected in Henan Province, North China and Northeast China since the 1980s. A large number of studies have shown that the dry heart is a physiological disease induced by calcium deficiency in Chinese cabbage, not caused by pathogen infection.
Dry heartburn begins at the end of the rosette and becomes severe at the ball stage. Symptoms in the rosette stage are the outer leaf margins are dry and the leaves are slightly buckled into the inner leaf of the scoop type. The farmers' Phnom Penh is affected during the ball stage. The typical pathological condition is that the inner leaf margins are yellow and the paper is not wide and narrow. One, and the neighboring internal leaves, the symptoms gradually reduce, to the edge of the leaves of the leaves are thin and do not change color, lesions gradually disappear. This situation is also called dry folder. During the growth period or during storage, the lesions will also appear to be rotting, which is also called rotting. The dry heartburn occurred more often between the leaves of 4 leaves and 15 leaves, and there was less occurrence of globules in other parts.
First, the occurrence of dry heartburn and the following factors have a closer relationship.
1. From the weather conditions, the occurrence of dry heartburn is directly affected by the humidity of the air. Humidity in the air is high, and dry heartburn is light; on the contrary, it is heavy. Because the humidity of the air is affected by sunshine, precipitation, and temperature, it is lighter in years with more precipitation, less sunshine, and lower temperatures.
2. The weight of saline land is heavy. The high concentration of soil solution in the saline-alkali soil not only hinders the absorption capacity of the roots, but also hinders the absorption of calcium, which increases the incidence of dry heartburn.
3, Rosette water control is too high, the ball is initially concentrated in the use of nitrogen fertilizer is concentrated, in the case of large water and large fertilizer, the rapid growth of the ball, due to poor mobility of calcium in the body, resulting in the lack of calcium leaf edge, resulting in partial calcium deficiency.
Second, control methods
1, increase the use of organic fertilizers, in the case of no reduction in yield, try to control the amount of nitrogen fertilizer, especially in the late Rosette dressing should not be too concentrated.
2, the lotus period to master the principle of seeing wet seeing water, the Miao should not be excessive.
3, strict control of the appropriate sowing date.
4, using calcium measures. With 0.7% of water calcium chloride added 20,000 times of naphthalene acetic acid foliar spray, spraying from the end of the rosette 3 times -5 times, there is a certain control effect.
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