What causes the hollow of the main stem of broccoli?

What causes the hollowing of broccoli stems? Broccoli stem hollow, but not rotten, is due to physiological disorders and the formation of. If the selection of varieties and planting management is not appropriate, resulting in plant physiological disorders, so that hollow will form, seriously affecting the quality of commodity bulbs and commodity value, resulting in losses. 1. The occurrence of hollow symptoms of the main stem is mainly formed during the mature period of the flower bulb. At first, several small elliptical gaps were formed in the stem tissue. As the plant grew and matured, the small gaps gradually expanded and connected into a large gap, which formed a hollow in the stem. When the hollow was serious, it extended to the flower stem. The cavity surface lignifies and turns brown, but does not decay, and no pathogen is detected from the discolored tissue. Second, the main stem hollow causes 1, planting plant spacing is too large, excessive nitrogen fertilizer, especially in the flower bulb growth period, plant growth too fast, easy to cause hollow occurrence. 2. Lack of water or improper watering during vegetative growth period and flower bulb growth period is easy to cause the occurrence of empty stems. 3, broccoli is a cool crop, the appropriate growth temperature is 15~ 22℃, such as improper planting season arrangement, in the flower ball growth period in case of high temperature ( 25℃ above), so that the flower ball grows too fast, easy to cause hollow. 4. Boron deficiency can induce the change of cell wall structure in stem tissue, which leads to the degeneration of stem tissue and the formation of hollow with lignification. 5. Different varieties have certain differences in susceptibility to hollow, some varieties have wide adaptability, not easy to hollow, and some varieties are easy to hollow. 3. Control measures 1. Choose varieties that are not easy to hollow. 2. Timely sowing, cultivation of strong seedlings, timely planting, staggered flower bulb growth period encountered high temperature weather. 3, according to the characteristics of the varieties used, reasonable density planting. The suitable plant spacing is 30~45 cm and row spacing is 60~70 cm. 4. Fertilizer and water management. Water management: keep the soil dry and wet, generally require watering every 5 to 7 days. Fertilizer management: under the condition of applying sufficient base fertilizer, nitrogen fertilizer can be applied 6-8 kg per mu with watering, and the principle of small amount and multiple times is to increase the application amount of phosphorus and potassium fertilizer during the flower bulb growth period. For boron deficient soil, 0. 5 kg boron fertilizer as base fertilizer, then 0. 5 kg for topdressing or root irrigation. 5. Timely harvest. It can be harvested within 10 - 15 days from the flower ball. Early bulbs do not fully grow, low yield, too late easy to form empty stems, and flower bulbs easy to loose, withered buds, lose its commercial value. Click for more cauliflower growing techniques Click for more vegetable growing techniques