During the cultivation process, leaf ball cracking often occurs, affecting the appearance of cabbage. In addition, the cracked leaf ball is susceptible to rot by pathogen infection during storage and transportation. The most common is the cracking of the top of the leaf ball, sometimes the side is also cracked. More than one line cracking, there are vertical and horizontal cracking. The degree of cracking is different. The light only leaves several layers of leaves outside the leaf blade cracking, and the severe cracking can be deep to shorten the stem.
Etiology: The main cause of leaf ball cracking is due to excessive swelling of the cells due to water absorption. Water content in cabbage is more than 90%, cabbage root distribution is shallow, leaves are large, evaporation is large, and it grows best when soil moisture is 70%-80%. If the soil moisture is not enough, the cabbage will be small and not tight. Therefore, always water to keep the soil moist. However, when cabbage is put on the ball, the structure of the leaf ball is crisp and the flexibility of the cells is small. Once the soil water is too much, it is easy to cause cracking of the leaf ball.
Control methods: Select the soil with flat terrain, convenient drainage and irrigation, and fertile soil to grow cabbage. Selecting the species that are not easy to crack, the situation of fission between the cabbage varieties is not the same, generally the sharp-headed species has less fissures, while the round-headed and flat-headed species have more fissures. Strengthen the management of water and fertilizer, apply sufficient basic fertilizer, apply more organic fertilizer, enhance the ability of soil to retain water and maintain fertilizer, and buffer the effects of excess, too little, and drastic changes in the soil on the plants. Cabbage needs a large amount of water and it is watered many times throughout the growing season. Watering should be appropriate, and soil moisture should be used as a standard to avoid flooding and water should not be accumulated on the ground after watering. After the rain, the accumulation of stagnant water in the fields, especially the heavy rain after the ball bearing on the cabbage, caused a large amount of fissure balls. Timely harvest, over-ripe leaf balls are easy to crack.
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