Radish Physiological Diseases and Their Control Measures

Radishes often cause a variety of physiological diseases under adverse natural and cultivation conditions, which seriously affect their yield and quality. 1. Common physiological diseases of radish 1.1. Malformed roots: In the early stages of radish development, the main root growth point is damaged or obstructed, resulting in lateral root hypertrophy, fleshy root bifurcation or other types of malformations. According to the survey, where there is too much rain or irrigation, soil compaction; the application of organic fertilizer is not well cooked or uneven fertilization; soil plough layer is shallow or there are hard stones under the roots; underground pests are more, the main root is bitten at the seedling stage, etc. It is easy to form deformed roots. 1.2. Cracking: The weather is prolonged and the soil is dry for a long time. The growth of the roots is temporarily paused, and then the heavy rain or water is suddenly dropped, the roots grow rapidly, and cracking occurs easily. 1.3. Black skin (or black heart): The soil is hard, hard, and poorly ventilated. With the application of fresh manure, the microbial activity in the soil is strong, causing black or black hearts in some tissues due to lack of oxygen. In addition, radish infection with black rot will also appear black heart. 1.4. Heart-feeding: The heart is a disease caused by the rapid enlargement of the straight roots and the lack of boron nutrition in the central delivery tissue. According to another study, the lack of potassium in the soil during cultivation, the excessive application of nitrogen fertilizer at the later stage of growth, and the excessive growth of leaf clusters can also cause heart failure. 1.5, spicy: radish contains mustard oil, its content is moderate, the radish flavor is good, too much content is spicy; where the climate is hot, drought or organic fertilizer is insufficient, it is easy to make radish mustard oil content increased . 1.6, bitter taste: radish in the growing process, when the weather is hot or the application of nitrogen fertilizer and phosphorus, potassium fertilizer is insufficient, the roots of the meat easily produce a nitrogen-containing basic compound - momordicin, so that radish appears bitter. 1.7, lack of prime disease: lack of nitrogen, plant dwarf, slow growth, narrow and thin leaves, yellow leaves, thin stems, root development is not normal, fine and small, more lignified, increased spicy taste; lack of phosphorus, The back of the leaves is purple, the leaves are small and shrunken, and the fleshy roots are undeveloped; in the absence of potassium, the middle part of the leaves initially appear dark green, the leaf margins are curled, appear pale yellow to brown, the lower leaves and stems appear yellow to bronze, and the leaves thicken. The roots do not expand normally. 2. Control Measures 2.1. Selection of Fine Varieties: Generally, the shallowly-divided varieties are not prone to malformed roots; those with less water content and dense flesh are not prone to cracking; the varieties of white or white-green skins are lighter in terms of bitterness and bitterness. 2.2. Choosing an appropriate plot: Before planting, choose a deep plot of soil and plow deeply to make the soil loose. 2.3. Scientifically increasing fertilizing materials: The organic fertilizer applied to the soil must be fully decomposed and thoroughly distributed. At the same time, phosphorus and potash fertilizers should be added appropriately to prevent the single application of large amounts of nitrogen fertilizers; Boric acid or borax 0.5-1 kg, and in the straight root swelling with 0.2% -0.5% borax or boric acid solution foliar spray, spray once every 3-4 days, and even spray 3-4 times. 2.4. Reasonable watering: Prevent it from drying out or over-drying.

Hospital Bed

Medical Beds Price,Medical Beds,Hospital Bed

Care Home Healthcare Supplies Co., Ltd. , http://www.szmedicalmattress.com