When winter lettuce is harvested, it is often found that there are many cracks in the stem, affecting the commercial nature, and heavy wounds cause soft rot and Sclerotinia to become dark brown. Lettuce into the stem hypertrophy period, the need for adequate nitrogen fertilizer and water in order to promote the rapid expansion of tender stems, but in the late mast hypertrophy, especially close to the harvest period, due to excessive watering, or continuous heavy rain, the base of the stem often Longitudinal rifts appear. This phenomenon occurs mainly due to weather or management reasons. Close to the harvesting period, the base of the stem has hardened. When it encounters too much rainfall or watering, the inside of the stem grows fast and generates turgor. The outer hardened epidermis produces wall pressure inward because the bulging pressure is greater than the wall pressure. , so that the base of the tender stem longitudinal cracks. At the same time, it is under conditions of high humidity, which is suitable for the propagation and spread of pathogenic bacteria, so it is easy to develop. This phenomenon is more common in the cultivation of spring lettuce with more rain. Autumn Lettuce If the earlier drought is not growing well, the sudden precipitation or artificial watering at a later stage can easily lead to this situation. After the cracking of the stems of lettuce, the measures for radical treatment are more difficult, mainly taking preventive measures. The overwintering lettuces return to the early Qing Dynasty, and the management of fertilizers and waters should be controlled mainly to expand and enrich the leaf area, and prepare nutrient substances for stem hypertrophy. When entering the lotus sitting period, the number of leaves increased significantly, the heart leaf and lotus leaf sitting flat, the asparagus stem hypertrophy accelerated, should be fertilized with water, pay particular attention to increase available nitrogen fertilizer and potassium fertilizer, application of 15 kg of urea per mu or ammonium sulfate 20 kg, potassium sulfate 20 kg, conditions can be applied 1 to 2 times fecal dilute water, each 1000 to 1500 kg. However, if fertilization is to be reduced, it must be done diligently and not too late. At this time, it is also a critical period for water demand. It can neither make the soil dry, otherwise it will start to water, and the lettuce stem will be cracked due to rapid water swelling. It is also not too early to water, and if it is poured too early, it is easy. The leaves are long and the young leaves do not grow well. Therefore, the water should be poured less, and the water should be even to prevent cracking of the lettuce. Watering is controlled near the harvesting period, and timely rainfall is encountered.
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