Prevention and control measures for hollow cracking of celery petiole

During the growth period of celery, especially in the middle and later stage, white spots, hollow, or lateral and longitudinal cracking of petiole often appear on the cross section of petiole. The reasons and solutions are as follows.

The soil is boron deficient. This is the main cause of petiole cracking. 0.5 Mu of 1 kg borax is applied as base fertilizer, and once a slight crack is found, 0.2% Mel 0.5% borax aqueous solution can be used for foliar spray, or 0.25% borax aqueous solution can be used to irrigate the root.

Improper sowing time or less nitrogen fertilizer. The autumn planting in the open field is too late, coupled with the lack of nitrogen fertilizer, the plant growth is poor, the plant can not meet the harvest standard in the harvest season, but in the case of delayed harvest, it is vulnerable to low temperature and cold wave, petiole softening, aggravating the hollow phenomenon. Therefore, all localities should determine the suitable sowing date according to the local climatic conditions and cultivation facilities, and strengthen fertilizer and water management before and during the middle stage of growth to provide adequate nitrogen fertilizer.

The plant is frozen. Celery can't stand the cold. The symptoms of freezing are easy to occur when the temperature is below 0 ℃ or below 0 ℃. When the plant is seriously frozen, the petiole tissue structure is destroyed, after the temperature rises, the tissue can not recover, the cell gap increases, resulting in hollow. Therefore, in the process of cultivation, freezing should be prevented, and heat preservation measures should be adopted to avoid overwintering in the open field.

The variety degenerated. Celery and common celery are easy to cross naturally, so celery must be strictly isolated from other celery varieties when keeping seeds. At the same time, some hollow plants should be avoided in seed production so as not to increase the proportion of hollow plants.